This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'Pleomorphism is most commonly seen in: \nSelect and explain. \nA. Anaerobic staphylococci, B. H. influenzae, C. Corynebacterium diphtheria, D. Brucella abous', 'role': 'user'}, {'content': 'Answer: B \nExplanation: H. influenzae', 'role': 'assistant'}]