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
The optimum floor space recommended per adult person in a house 
Select and explain. 
A. 101–150 sq.ft., B. 70–90 sq. ft., C. 151–200 sq.ft., D. 201–250 sq. ft.
B: 70–90 sq. ft.
Answer: B: 70–90 sq. ft. 
Explanation: Optimum floor space recommended per adult person in a house: 70 – 90 sq.ft. (7 – 9 sq.m.)