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': 'Most common protozoan parasite is \nSelect and explain. \nA. Toxoplasma gondii, B. Trypanosoma, C. Plasmodium, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Toxoplasma gondii\xa0is an obligate intracellular parasitic one-celled eukaryote\xa0 that causes the infectious disease toxoplasmosis\xa0 domestic cats, are the only known definitive hosts in which the parasite may undergo sexual reproduction.\nIn humans, T. gondii is one of the most common parasites in developed countries.', 'role': 'assistant'}]