This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Air, Light, Sound, Housing, Radiation, Waste Disposal, Subject name: Social & Preventive Medicine
All are criteria for 'Problem Village' EXCEPT 
Select and explain. 
A. Radial distance > 1.6 kms, B. Depth > 50 m, C. Elevation > 100 m, D. Excess of Salt
B: Depth > 50 m
Answer: B: Depth > 50 m 
Explanation: Problem village Radial distance - > 1.6 km Depth - >15 mtr. Elevation - > 100 mtr Excess of iron & salt, Arsenic, Fluoride