**Core Concept**
The question revolves around the regulatory framework governing blood banks in a country. Blood banks require licensing to ensure compliance with safety standards, quality control, and patient protection. This involves adherence to guidelines set by national or international authorities.

**Why the Correct Answer is Right**
The correct answer is obtained from the Drugs and Cosmetics Act, 1940, and the Drugs and Cosmetics Rules, 1945, of India, which mandate that blood banks must obtain a license from the state licensing authority. This license is granted after inspecting the facilities and ensuring that they meet the required standards for blood collection, testing, processing, storage, and distribution.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as the Drugs and Cosmetics Act, 1940, primarily deals with the licensing of pharmaceutical and medical devices manufacturing units, not blood banks.
**Option B:** This option is incorrect as the Clinical Establishments Act, 2010, regulates private and government hospitals but does not specifically address blood banks.
**Option C:** This option is incorrect as the Transplantation of Human Organs Act, 1994, deals with organ transplantation and does not cover blood banks.

**Clinical Pearl / High-Yield Fact**
It is essential to note that blood banks must adhere to the National Blood Policy and the Indian Council of Medical Research (ICMR) guidelines for blood banking, which outline the standards for blood collection, testing, processing, storage, and distribution.

**Correct Answer: D. State licensing authority.**