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: Surgery
[{'content': 'Syncope: \nSelect and explain. \nA. Is associated with bradycardia and loss of consciousness, B. Never occurs in children, C. Always associated with hypoglycemia, D. Best treated in a sitting posture', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]