**Core Concept**
The question is testing the student's understanding of the bed strength at a Community Health Centre (CHC), which is a part of the public health infrastructure in India. Bed strength refers to the number of hospital beds available for patient care. CHCs are designed to provide secondary-level healthcare services, including specialized care, emergency services, and diagnostic facilities.

**Why the Correct Answer is Right**
The correct answer is based on the National Health Policy of 2017, which emphasizes the need for strengthening the public health infrastructure, including CHCs. CHCs are expected to have a bed strength of 30-60 beds, depending on the population served. This bed strength is determined based on the population norms, which vary depending on the urban or rural setting. For example, a CHC serving a population of 80,000-120,000 in a rural area is expected to have a bed strength of 30 beds.

**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because CHCs are not expected to have a bed strength of less than 10 beds, as this would not be sufficient to provide adequate healthcare services to the population served.

**Option B:** This is incorrect because CHCs are not expected to have a bed strength of more than 100 beds, as this would be more than what is needed for a secondary-level healthcare facility.

**Option C:** This is incorrect because there is no standard bed strength for CHCs in India, and the correct answer is based on the National Health Policy of 2017.

**Clinical Pearl / High-Yield Fact**
A key aspect of healthcare planning in India is the population norms for bed strength in different healthcare facilities, including CHCs. Understanding these norms is crucial for healthcare administrators and policymakers.

**Correct Answer: D. 20-30 beds**