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: ENT
[{'content': 'Skin over pinna is fixed: \nSelect and explain. \nA. Firmly on both sides, B. Loosely on medial side, C. Loosely on lateral side, D. Loosely on both side', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Skin over the pinna is closely adherent to the perichondrium on the lateral surface while it is loosely attached on the medial surface.', 'role': 'assistant'}]