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 stained by? \nSelect and explain. \nA. Ponder's stain, B. Negative stain, C. Gram's stain, D. Leishman stain", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Ponder's stain", 'role': 'assistant'}]