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
Which one of the following is the standard prescribed for setback (open space around the house) in rural areas" 
Select and explain. 
A. Built up area 1/3 and open space 2/3, B. Built up area 2/5 and open space 3/5, C. Built up area 4 and open space 'A, D. Built up area 'A and open space 3/4
A: Built up area 1/3 and open space 2/3
Answer: A: Built up area 1/3 and open space 2/3 
Explanation: Ans. is 'a' i.e., Built up area 1/3 and open space 2/3