This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
How much land is required for a population of 10000, to have a deep trench 
Select and explain. 
A. 5 acre, B. 3 acre, C. 2 acre, D. 1 acre
D: 1 acre
Answer: D: 1 acre 
Explanation: * Sanitary landfill(controlled tipping)- most satisfactory method when land is available * Trench, ramp, area method. In trench method it is estimated that one acre of land per year will be required for 10000 population. Ref:- K Park, 24th ed; pg num:- 791