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': 'P. Carni causes infection of primarily ? \nSelect and explain. \nA. Rats, B. Mice, C. Humans, D. Rabbits', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Rats . Although the organisms within the pneumocystis genus are morphologically very similar, they are genetically diverse and host specific --> P jirovecii infects humans, where as Pcarinii infects rats.", 'role': 'assistant'}]