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: Microbiology
[{'content': 'Primary complex of M bovis involves: \nSelect and explain. \nA. Tonsil and lung, B. Tonsil and intestine, C. Tonsil and skin, D. Skin and Intestine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is. 'b' i. e., Tonsil and intestine", 'role': 'assistant'}]