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: Unknown
[{'content': "One of the following is a definite sign of death due to drowning- \nSelect and explain. \nA. Sand and mud in the mouth and nostrils, B. Fine lathery froth in the mouth and nostrils, C. Washerman's hands and feet, D. Diatoms in bone marrow", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans-D', 'role': 'assistant'}]