This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable Diseases, Subject name: Social & Preventive Medicine
[{'content': 'Malaria is regarded as a disease caused by: \nSelect and explain. \nA. Protozoa, B. Bacteria, C. Virus, D. Prions', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans) a (protozoa) Ref park 20th ed p 222Malaria is a protozoal disease caused by infection with parasites of genus plasmodium and transmitted to man by certain species of infected female Anopheline mosquito.', 'role': 'assistant'}]