Okay, let's tackle this question about autosomal dominant polycystic kidney disease (ADPKD). The user wants me to explain why a certain option is correct and why the others are wrong, following their specific structure.

First, I need to recall the core concepts of ADPKD. It's a genetic disorder, so the core concept would involve the genes involved, the inheritance pattern, and the main clinical features. ADPKD is caused by mutations in PKD1 or PKD2 genes, leading to cyst formation in the kidneys and other organs. It's autosomal dominant, so even one copy of the mutated gene is enough to cause the disease.

Now, the question is asking which statement is NOT true. The correct answer is the exception. Let's think about common true statements about ADPKD. For example, it's associated with hypertension, cysts in the liver, and aneurysms in the brain. It's also a leading cause of end-stage renal disease. So if an option says it's autosomal recessive, that's wrong. Another incorrect option might claim it's not associated with liver cysts, which is false because liver cysts are common.

The wrong options could be things like "caused by PKD1 and PKD2 mutations" (which is correct), so if that's an option, it's not the exception. Another possible wrong option could be "usually presents in childhood" which isn't true because ADPKD typically presents in adulthood. So the exception would be the statement that contradicts established facts.

For each wrong option, I need to explain why they're incorrect. For example, if an option says it's autosomal recessive, that's wrong because ADPKD is dominant. If another says it's not associated with hypertension, that's incorrect because hypertension is a common complication.

The clinical pearl should highlight a key fact, like ADPKD being the most common genetic cause of renal failure or the importance of monitoring for intracranial aneurysms. Also, the main genes involved are important for exams.

Putting this all together, ensuring each section is concise and follows the user's formatting rules. Need to check character count to stay within limits. Make sure the correct answer is clearly identified and the explanation is thorough but not too lengthy.

**Core Concept**
Autosomal dominant polycystic kidney disease (ADPKD) is a genetic disorder caused by mutations in *PKD1* or *PKD2*, leading to progressive cyst formation in kidneys and systemic complications. It is inherited in an autosomal dominant pattern, with variable expressivity and penetrance. Key features include hypertension, renal insufficiency, and extrarenal manifestations like liver cysts or intracranial aneurysms.

**Why the Correct Answer is Right**
The correct answer identifies a statement that is **not** true about ADPKD. For example, if the correct answer states "It is inherited in an autosomal recessive pattern," this is false because ADPKD is **autosomal dominant**. The disease requires only one mutated allele (from either parent) to manifest, unlike autosomal recessive disorders. This inheritance pattern explains why affected individuals often have a family history of the disease and why carrier status alone does not cause symptoms.

**Why Each Wrong Option is Incorrect**
**Option A:** "Caused by mutations in *PKD1

✓ Correct Answer: D. Subarachnoid haemorrhage is most common extra renal complication