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': 'Metachromatic granules are found in: \nSelect and explain. \nA. Diphtheria, B. Mycoplasma, C. Chlamydia, D. Staphylococcus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Metachromatic granules\n\nIt is a type of intracytoplasmic inclusion\xa0characteristically seen in diphtheria bacilli.\nAlso known as volutin or metachromatic or Babes Ernst granules.\nStrongly basophilic bodies consist of polymetaphosphate.\nThey are reservoir of energy and phosphate.\nThey are most frequent in cells growing under nutritionally deficient condition.\n\nRemember :\n\nMetachromatic granules are also seen in B.pertussis (whooping cough).', 'role': 'assistant'}]