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: Anatomy
[{'content': 'Intracapsular but extrasynol is ? \nSelect and explain. \nA. Long head of triceps, B. Long head of biceps, C. Sho head of biceps, D. Medial head of biceps', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Origin of long head of biceps is intracapsular but extrasynol, enclosed by a prolongation of synol membrane of shoulder joint.', 'role': 'assistant'}]