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': 'Presence of maggots at post mortem indicates - \nSelect and explain. \nA. Duration since death, B. Cause of death, C. Mode of death, D. Posture of body at time of death', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Presence of maggots helps in determining the time since death.', 'role': 'assistant'}]