Correct Answer: B

Rationale: Ceftriaxone is a broad-spectrum third-generation cephalosporin antibiotic used to treat various bacterial infections. The normalization of temperature following its administration indicates that it effectively addressed an underlying bacterial infection, leading to resolution of fever. This response confirms its antimicrobial efficacy rather than a direct antipyretic effect, as antibiotics work by eliminating infection rather than suppressing fever symptoms. The absence of other infection signs supports successful bacterial eradication. Ceftriaxone does not function as an analgesic, antipyretic, or anticoagulant, reinforcing that the normalization of temperature is secondary to infection control achieved by antibiotic therapy.

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