Step 1: Understanding the Concept:
Drugs are classed by the effect they have. We need the class that relieves pain without causing unconsciousness, mental confusion or other disturbance of the nervous system.
Step 2: Check each:
Analgesic (such as aspirin and paracetamol) relieves pain without loss of consciousness. Correct.
Antipyretic lowers body temperature during fever.
Antibiotic kills or stops the growth of bacteria.
Antimicrobial acts against microbes such as bacteria, fungi and viruses in general.
Final Answer:
The term is analgesic, option (A).
\[ \boxed{\text{Analgesic}} \]