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': 'Pneumocystic carnii infects: \nSelect and explain. \nA. Human, B. Monkey, C. Rat, D. Cats', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. c. Rat', 'role': 'assistant'}]