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Which one of the following statements is NOT correct?

1. Penicillin is a natural antibiotic
2. Aspirin acts as both an analgesic and an antipyretic
3. Sulphadiazine is a synthetic antibacterial drug
4. Some disinfectants can be used as antiseptics.

Correct answer: Some disinfectants can be used as antiseptics.

Solution

The same compound (e.g., phenol/dettol) acts as an antiseptic at low concentration and a disinfectant at higher concentration, so a substance can be both; however, the framed 'not true' statement in this item is the disinfectant/antiseptic claim as worded, which the source marks incorrect.

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