**Core Concept**
The question is testing knowledge of healthcare infrastructure, specifically the minimum requirements for a community health centre (CHC) in terms of bed capacity. This is crucial for understanding the hierarchy and functionality of healthcare facilities.

**Why the Correct Answer is Right**
A community health centre is a referral unit for primary health centres, providing specialized care. According to norms, a CHC should have a minimum of 30 beds to provide emergency care, obstetric care, and other services. This capacity ensures that the CHC can manage a reasonable patient load and provide necessary medical services to the community.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it underestimates the bed capacity needed for a functional CHC.
**Option B:** Similarly, this is too low for the minimum requirements of a CHC.
**Option D:** This option exceeds the minimum requirement, making it an incorrect choice for the minimum.

**Clinical Pearl / High-Yield Fact**
Remember, the hierarchy of healthcare facilities includes sub-centres, primary health centres (PHCs), community health centres (CHCs), sub-district hospitals, and district hospitals, each with specific bed capacities and service provisions.

**Correct Answer:** C. 30 beds