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: Medicine
[{'content': 'Which is the commonest site for extrapulmonary TB ? \nSelect and explain. \nA. Pleura, B. Lymph node, C. Intestine, D. Meninges', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]