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
Problem village is all except 
Select and explain. 
A. No water source in a distance of 1.6 km from community, B. Water is more than depth of 15 metres, C. There is excess of Na+, K+ and Flouride salts, D. Risk of Guinea worm infection
D: Risk of Guinea worm infection
Answer: D: Risk of Guinea worm infection 
Explanation: A problem village has been defined as one where 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 15 metres or where water sources has excess of salinity, iron,flouride, and other toxic elements or where there are exposed to risk of cholera. Risk of guinea worm infection is not a criterion for problem village. Ref: Park&;s textbook of preventive and social medicine.K Park. Edition 23. Pg no: 476