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