This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
False about guidelines on sanitary well 
Select and explain. 
A. >15 m away from drinking water source, B. Minimum 20 feet depth, C. Parapet wall should > 20 cm above ground, D. Parapet wall should > 75 cm above ground
C: Parapet wall should > 20 cm above ground
Answer: C: Parapet wall should > 20 cm above ground 
Explanation: None