## **Core Concept**
Otosclerosis is a condition characterized by abnormal bone growth in the middle ear that causes hearing loss. The mode of inheritance of otosclerosis involves genetic factors. It is known to have a familial component.

## **Why the Correct Answer is Right**
The correct answer, , indicates that otosclerosis is inherited in an autosomal dominant pattern. This means a single copy of the mutated gene is enough to cause the condition. The autosomal dominant inheritance pattern explains why otosclerosis often runs in families, with each child having a 50% chance of inheriting the mutated gene from an affected parent.

## **Why Each Wrong Option is Incorrect**
* **Option A:** - This option suggests an X-linked recessive pattern, which is not characteristic of otosclerosis. X-linked recessive conditions primarily affect males.
* **Option B:** - This option suggests an autosomal recessive pattern, which would require an individual to inherit two copies of the mutated gene (one from each parent) to express the condition. This is not the typical inheritance pattern observed in otosclerosis.
* **Option D:** - This option suggests a multifactorial inheritance pattern, which involves a combination of genetic and environmental factors. While it's true that environmental factors can influence the expression of otosclerosis, the primary mode of inheritance is not multifactorial but rather genetic with a strong familial component.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that otosclerosis tends to affect women more frequently than men, and the condition often becomes apparent during pregnancy, suggesting that hormonal factors may play a role in its progression. However, the genetic predisposition remains a critical factor.

## **Correct Answer:** . Autosomal dominant.