**Core Concept:** Tuberous sclerosis is a genetic disorder characterized by the development of benign tumors in various organs, particularly the brain, kidney, and lungs. It is caused by mutations in one of the genes involved in the regulation of cell growth and differentiation, specifically the TSC1 and TSC2 genes.

**Why the Correct Answer is Right:** Tuberous sclerosis is an autosomal dominant genetic disorder, meaning that one copy of the mutated gene is sufficient for the disease to be expressed. In this case, the correct answer is "A" - autosomal dominant.

Autosomal dominant inheritance occurs when an affected individual has a 50% chance of passing the condition to each of their children, regardless of the sex of the parent or offspring. In Tuberous sclerosis, the affected individual has a 50% chance of passing the disease to their offspring, as the gene responsible (TSC1 or TSC2) is located on an autosomal chromosome.

**Why Each Wrong Option is Incorrect:**

**Option B (Autosomal Recessive):** This type of inheritance requires an affected individual to pass on two mutated copies of the gene, one from each parent. In Tuberous sclerosis, this is incorrect because only one mutated copy is sufficient for the disease to manifest.

**Option C (X-linked dominant):** This type of inheritance is associated with genes located on the X chromosome and requires an affected individual to pass on the mutated gene from one parent. Tuberous sclerosis is not X-linked, as it follows autosomal dominant inheritance.

**Option D (X-linked recessive):** Similar to X-linked dominant, X-linked recessive inheritance requires an affected individual to pass on two mutated copies of the gene from one parent. Tuberous sclerosis does not follow this pattern, as it is an autosomal dominant disorder.

**Clinical Pearl:** Understanding the mode of inheritance is crucial for genetic counseling and predicting the risk of disease in offspring for families affected by Tuberous sclerosis.

**Correct Answer:** Autosomal dominant (Option A)

In Tuberous sclerosis, the affected individual has a 50% chance of passing the disease to their offspring, regardless of the sex of the parent or offspring. This knowledge is essential for genetic counseling purposes and helps predict the risk of disease in offspring for families affected by Tuberous sclerosis.