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 effective temperature of 'comfo zone is% 
Select and explain. 
A. 25-26.9deg C, B. 27-29deg C, C. < 19degC, D. 19-23deg C
A: 25-26.9deg C
Answer: A: 25-26.9deg C 
Explanation: Arm. is 'a' i.e 25-26.90 C