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': 'Following are larval control measures except? \nSelect and explain. \nA. DDT, B. Paris green, C. Gambusia fish, D. Intermittent irrigation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]