This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Water, Subject name: Social & Preventive Medicine
What is meant by Catchment area? 
Select and explain. 
A. The area draining into the reservoir, B. The area draining into rivers, C. The area draining into tanks, D. The area draining into sea water
A: The area draining into the reservoir
Answer: A: The area draining into the reservoir 
Explanation: IMPOUNDING RESERVOIRS- These are aificial lakes constructed usually of eahwork or masonry in which large quantities of surface water is stored. Dams built across rivers and mountain streams also provide large reserves of surface water. The area draining into the reservoir is called "Catchment area".