This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
[{'content': 'Metachromatic granules are seen in \nSelect and explain. \nA. Corynebacterium, B. Clostridium, C. Chlamydia, D. Mycoplasma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Metachromatic granules (Volutin, Babes Ernst, polar bodies) are present in Corynebacterium. These granules act as energy stores and are made of polymetaphosphate. Present more at the poles. Are more gram positive than the cytoplasm on Gram staining. These granules are stained by toluidine blue in Albe/Neisser/Ponder stain.', 'role': 'assistant'}]