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 essential ingredient in the space sprays for vector control is – \nSelect and explain. \nA. Malathion, B. Fenithion, C. Pyrethrum, D. BHC', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]