This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Roll back malaria included all except - \nSelect and explain. \nA. Insecticides nets, B. Strengthening health system, C. Develop new insecticide, D. Training health workers', 'role': 'user'}, {'content': "Answer: D \nExplanation: Insecticides nets, Strengthening health system, Develop new insecticide,. REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 21ST EDITION. PAGE NO - 243", 'role': 'assistant'}]