## **Core Concept**
Vitamin A overdose primarily affects the liver and can lead to a condition known as pseudotumor cerebri or increased intracranial pressure. This condition arises due to the toxic effects of excessive vitamin A on the body.

## **Why the Correct Answer is Right**
The correct answer, **C. CNS (Central Nervous System)**, is right because an overdose of vitamin A leads to symptoms such as headache, nausea, vomiting, and in severe cases, pseudotumor cerebri, which is characterized by increased intracranial pressure. This condition manifests with symptoms like papilledema, headaches, and visual disturbances. The mechanism involves the toxic metabolite of vitamin A affecting the brain and the cerebrospinal fluid dynamics.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While the liver plays a crucial role in vitamin A metabolism and storage, and it can be affected by vitamin A toxicity (leading to liver damage), the question seems to focus on the primary presentation or effect of vitamin A overdose.
- **Option B:** The kidneys are not the primary organs associated with the acute effects of vitamin A overdose.
- **Option D:** Although the skin can exhibit symptoms of vitamin A toxicity (such as dryness, itching, and desquamation), it is not the primary system affected in terms of the acute and severe manifestations of vitamin A overdose.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that vitamin A toxicity can present with signs of increased intracranial pressure (pseudotumor cerebri), including headache, nausea, vomiting, and papilledema. This condition can be life-threatening if not recognized and managed promptly.

## **Correct Answer:** . CNS (Central Nervous System)