This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Health Programmes in India, Subject name: Social & Preventive Medicine
[{'content': 'A problem village is one wrhere - \nSelect and explain. \nA. Source of water > 1[?]6 km away, B. Water available > 15 meters depth, C. Excess of fluoride in water, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is i.e., All of the above o A problem village has been defined as oneWhere no source of safe water is available within a distance of 1.6 km, or Where water is available at a depth of more than IS meters, orWhere water source has excess salinity, iron, fluorides and other toxic elements, orWhere water is exposed to the risk of cholera.', 'role': 'assistant'}]