This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disaster Management, Subject name: Social & Preventive Medicine
[{'content': 'MC disease in Post-disaster phase is:- \nSelect and explain. \nA. Malaria, B. Typhoid/ Cholera, C. Scabies, D. TB', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Post disaster phase: M/C disease - Typhoid/Cholera M/C vitamin deficiency - Vit A, Vit B3, Vit C, Iron Vaccination to be given - None (contraindicated); Except - Measles vaccine Most impoant preliminary step - chlorination of water.', 'role': 'assistant'}]