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: Social & Preventive Medicine
[{'content': 'The mechanisms by which cholera might be maintained during the intervals between peak cholera seasons is - \nSelect and explain. \nA. Carrier status in animals, B. Carrier status in man, C. An environmental reservoir, D. Continuous transmission in man', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]