This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
[{'content': 'Sanitary toilets can decrease incidence of all except \nSelect and explain. \nA. Diarrhoea, B. Poliomyelitis, C. Malaria, D. Cholera', 'role': 'user'}, {'content': "Answer: C \nExplanation: Diarrhea, Poliomyelitis, and cholera are transmitted by faeco-oral route Malaria is a vector-borne disease transmitted by Anopheles mosquito. Hence sanitary toilets and hand washing practices cannot prevent Malaria. Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 831", 'role': 'assistant'}]