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': 'Smothering is \nSelect and explain. \nA. Asphyxia caused by mechanical occlusion of trachea or bronchi, B. Asphyxia caused by mechanical occlusion of nose and mouth, C. Asphyxia caused by getting locked inside closed space, D. Any of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Smothering is asphyxia caused by mechanical occlusion of external air passages (nose and mouth) by hand, cloth, pillow etc.', 'role': 'assistant'}]