## **Core Concept**
Chediak-Higashi syndrome (CHS) is a rare, genetic disorder of the immune and nervous systems characterized by albinism, a bleeding tendency, and recurrent infections. It results from mutations in the LYST gene, which affects the formation and transport of lysosomes and melanosomes. This leads to the accumulation of abnormally large and dysfunctional lysosomes in various cells.

## **Why the Correct Answer is Right**
The correct answer is related to the characteristics of Chediak-Higashi syndrome. This syndrome is indeed associated with oculocutaneous albinism, a defect in natural killer cell function leading to recurrent infections, and a tendency towards bleeding due to platelet dysfunction. One of the provided options does not align with these features.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Oculocutaneous albinism is a hallmark of Chediak-Higashi syndrome. This condition leads to vision problems, photophobia, and an increased risk of skin cancers. Therefore, option A is a characteristic of CHS and is incorrect as the answer.
- **Option B:** A defect in natural killer cell function is indeed associated with CHS, contributing to the increased susceptibility to infections. Thus, option B is also a feature of CHS and incorrect as the answer.
- **Option D:** A tendency towards bleeding is observed in CHS patients due to platelet dysfunction. This results from the abnormally large and non-functional platelets. So, option D is a characteristic of CHS and incorrect as the answer.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that patients with Chediak-Higashi syndrome often experience a severe form of the disease known as the "accelerated phase," characterized by a rapidly progressive lymphoma-like condition, hepatosplenomegaly, and pancytopenia. Early recognition and management are critical.

## **Correct Answer: B.**