**Core Concept**
The Mother and Child Health (MCH) programme is a comprehensive health initiative aimed at improving the health and well-being of mothers and children. It encompasses various aspects of healthcare, including maternal and child health services, immunization, and disease prevention.

**Why the Correct Answer is Right**
Option a is incorrect because the MCH programme primarily focuses on children up to 5 years of age, not 12 years. The programme has been revised over the years, and its current focus is on children up to 5 years. **Option B:** is correct because the MCH programme does not primarily focus on preventing chronic diseases; rather, it aims to prevent acute and infectious diseases. **Option C:** is incorrect because the goal of 100% immunization against six vaccine-preventable diseases was set under the National Rural Health Mission (NRHM), not the MCH programme. **Option D:** is incorrect because while the MCH programme does aim to prevent acute respiratory infections, it is not its primary objective.

**Why Each Wrong Option is Incorrect**
**Option A:** is incorrect because the MCH programme primarily focuses on children up to 5 years of age, not 12 years. This is because the programme's objectives and interventions are tailored to meet the needs of young children, particularly those under 5. **Option C:** is incorrect because the goal of 100% immunization against six vaccine-preventable diseases was set under the National Rural Health Mission (NRHM), not the MCH programme. This is a key distinction, as the NRHM and MCH programme have different objectives and timelines.

**Clinical Pearl / High-Yield Fact**
The MCH programme is a critical component of India's public health infrastructure, with a focus on improving maternal and child health outcomes. It is essential to understand the programme's objectives and interventions to provide effective healthcare services to mothers and children.

**Correct Answer:**
✓ Correct Answer: B. ab