Correct Answer: A

Rationale: Ceftriaxone is a third-generation cephalosporin antibiotic that exerts its bactericidal action by inhibiting bacterial cell wall synthesis. It binds to penicillin-binding proteins, preventing cross-linking of peptidoglycan chains, leading to cell lysis and death. The normalization of the white blood cell count and reduction in fever demonstrate resolution of infection. Unlike drugs that target nucleic acids or ribosomes, Ceftriaxone’s primary site of action is the bacterial cell wall, making it effective against a broad spectrum of Gram-positive and Gram-negative organisms.

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