**Question:** Tuberculosis in children is

A. More common in infants
B. Less severe than in adults
C. Caused by the same Mycobacterium tuberculosis as adults
D. Primarily affects the lungs

**Core Concept:** Tuberculosis (TB) is an infectious disease caused by the bacterium Mycobacterium tuberculosis. In children, the disease presents differently compared to adults.

**Why the Correct Answer is Right:** In children, TB infection is usually acquired by contact with an infected adult. While adults primarily present with pulmonary tuberculosis (TB), children often have extrapulmonary TB, which involves other organs and tissues outside the lungs. This manifestation is more common in infants and toddlers, as their immune systems are still developing and may not mount an adequate immune response against the bacteria.

**Why Each Wrong Option is Incorrect:**

A. **Option A (True)**: Infants have a weaker immune system compared to older children and adults. This makes them more susceptible to severe TB disease, which presents with more severe symptoms and complications.

B. **Option B (False)**: TB in children is generally not less severe than in adults. In fact, severe complications are more likely in infants due to their weaker immune systems.

C. **Option C (False)**: TB is caused by the same Mycobacterium tuberculosis in both children and adults. However, the presentation and complications may differ.

D. **Option D (False)**: While pulmonary TB is more common in adults, extrapulmonary TB is more common in children due to their involvement of other organs and tissues.

**Clinical Pearl:** Extrapulmonary TB in children should raise suspicion for TB infection, as the disease presentation is different from that in adults. Early diagnosis and treatment are crucial to prevent severe complications and ensure favorable outcomes in pediatric patients.