**Core Concept**
The National Health Programmes in India focus on preventing and controlling various diseases, particularly those with significant public health impact. These programmes involve screening, early detection, and management to reduce morbidity and mortality.

**Why the Correct Answer is Right**
Dental caries, although a significant public health issue, is not a condition included in the National Health Programmes of India. The National Programme for Prevention and Control of Cancer, Diabetes, Cardiovascular Diseases and Stroke (NPCDCS) and the National Programme for Control of Blindness (NPCB) are the notable initiatives. These programmes focus on early detection and management of diabetes mellitus (A), refractive errors (C), and carcinoma cervix (D) through screening and awareness.

**Why Each Wrong Option is Incorrect**
**Option A:** Diabetes Mellitus has a National Programme for Prevention and Control of Cancer, Diabetes, Cardiovascular Diseases and Stroke (NPCDCS) for its management and control.
**Option C:** Refractive errors are addressed under the National Programme for Control of Blindness (NPCB), which aims to prevent and control blindness.
**Option D:** Carcinoma cervix is a target disease for the National Programme for Prevention and Control of Cancer, Diabetes, Cardiovascular Diseases and Stroke (NPCDCS) through cervical cancer screening.

**Clinical Pearl / High-Yield Fact**
It is essential to recognize that dental caries, despite its prevalence, is not a priority disease for national screening and control programmes in India. This highlights the need for community-based initiatives and awareness campaigns to address this significant public health issue.

**✓ Correct Answer: B. Dental caries**