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': 'The reservoir of protozoan infection caused by toxoplasma gondii in children is usually \nSelect and explain. \nA. Cats, B. Sheeps, C. Dogs, D. Rats', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]