**Core Concept:** Regular medical examination of school children is important for early detection and management of health issues. The school health committee recommends conducting these examinations at appropriate intervals.

**Why the Correct Answer is Right:**

The correct answer is **C. annually**. Regular medical examination of school children is essential for maintaining their overall health and wellbeing. By conducting annual evaluations, any potential health issues can be detected early, allowing for prompt intervention and management. This can prevent complications and reduce the burden on healthcare systems in the long run.

**Why Each Wrong Option is Incorrect:**

A. **Every three months (Monthly)** is too frequent and unnecessary. Excessive examinations can lead to unnecessary stress, anxiety, and financial burden for the families. Moreover, the human body undergoes significant changes during growth and development, and frequent examination may not be able to capture the true health status of the child.

B. **Every six months (Semi-annually)** is still too frequent. While more frequent examination is better than less frequent, every six months is excessive for most children, causing unnecessary stress and expenses.

D. **Every three years (Annually)** is too infrequent. Annual examinations are recommended for early detection and management of health concerns, ensuring the children receive timely interventions and improved health outcomes.

**Clinical Pearl / High-Yield Fact:**

**Annual health check-ups for school children** can help identify and manage various health concerns early, including growth and development, nutritional status, vision, hearing, dental health, and mental health. By addressing these issues promptly, children can receive appropriate care and prevent complications.

**Correct Answer:** C. annually