Step 1: Recall the use
Aspirin relieves pain and reduces fever and also thins blood. It belongs to the non-narcotic analgesics.
Step 2: Others
It does not kill microbes, so it is not an antimicrobial or antibiotic, and it is not an anti-oxidant. Option (A).
Final Answer:
Aspirin is an analgesic, option (A).
\[ \boxed{\text{(A)}} \]