**Core Concept**
The Bajaj Committee was established to regulate the medical education system in India by recommending guidelines for medical colleges and ensuring quality education.

**Why the Correct Answer is Right**
The Bajaj Committee played a crucial role in standardizing medical education in India, recommending guidelines for medical colleges, and introducing the concept of a uniform curriculum. The committee's recommendations aimed to ensure that medical graduates had a consistent level of knowledge and skills, regardless of the institution they attended. This led to the development of a uniform curriculum for medical education in India.

**Why Each Wrong Option is Incorrect**
**Option A:** The Bajaj Committee was not responsible for establishing the National Medical Commission (NMC), which was formed later to regulate medical education in India.
**Option B:** The Bajaj Committee did not focus solely on the regulation of medical colleges in the private sector.
**Option C:** The Bajaj Committee did not propose the implementation of a single, national entrance examination for medical students.

**Clinical Pearl / High-Yield Fact**
The Bajaj Committee's recommendations have had a lasting impact on the regulation of medical education in India, ensuring that medical graduates meet standardized standards.

**Correct Answer: D.**