Which of the following pairs are mismatched? I. Ceftriaxone: 3rd gen II. Cefaclor: 1st gen III. Cefdinir: 2nd gen IV. Ceftaroline: 5th gen

• A. I AND II
• B. II AND IV
• C. II AND III
• D. I AND III

Answer: (C)

Understanding cephalosporin generations helps you fit each drug to its correct label. Ceftriaxone is a third-generation cephalosporin. Cefaclor is a second-generation cephalosporin (not first). Cefdinir is a third-generation cephalosporin (not second). Ceftaroline is a fifth-generation cephalosporin. So the mismatches occur with Cefaclor being listed as first-generation and Cefdinir being listed as second-generation. The combination that correctly identifies both mismatches is the one that points to II and III. Therefore, the right answer is the option that indicates II and III.