Concept:
Retail pharmacy premises must satisfy legal space requirements.
Step 1: The Drugs and Cosmetics Rules prescribe minimum area requirements.
Step 2: For a retail pharmacy, the minimum required area is \(8\,m^2\).
Step 3: Proper area helps in storage, dispensing, and safe handling of medicines.
Step 4: Therefore, the correct value is 8.
\[
\boxed{8\,m^2}
\]