Correct Answer: A

Rationale: Amoxicillin, a broad-spectrum beta-lactam antibiotic, kills bacteria by inhibiting the transpeptidation reaction in bacterial cell wall synthesis. It binds to penicillin-binding proteins, preventing the formation of cross-links in the peptidoglycan layer, leading to cell lysis and death. The resolution of fever and sore throat after therapy demonstrates successful bacterial eradication. Amoxicillin’s mechanism differs from agents that inhibit protein or nucleic acid synthesis, which underscores its role in treating respiratory and ENT infections caused by susceptible bacteria.

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