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': 'In Roll Back Malaria program, which of the following is not a component? \nSelect and explain. \nA. Training for health care worker, B. Using Insecticide-treated bednets, C. Developing newer insecticides, D. Strengthening health system', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]