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': 'The dangerous layer of the scalp is: \nSelect and explain. \nA. Connective tissue., B. Loose areolar tissue., C. Aponeurosis., D. Pericranium.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]