Step 1: Cephalosporins share a class of adverse effects (hypersensitivity, diarrhea, superinfection) but several individual agents have signature toxicities. Recognising the drug tied to a specific effect is the key to this question.
Step 2: Ceftazidime is the cephalosporin classically linked with haematological suppression, producing neutropenia and thrombocytopenia. That makes option b the correct answer.
Step 3: The distractors carry different signatures. Cefoperazone (like ceftriaxone, cefamandole and moxalactam) is associated with hypoprothrombinaemia and bleeding from its methylthiotetrazole side chain and biliary excretion, plus a disulfiram-like reaction with alcohol, but not specifically thrombocytopenia. Cefixime and cefdinir are oral third-generation agents whose main issue is gastrointestinal upset, not platelet suppression.