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
To feel comfoable and cool in a factory the conrrected effective temperature ( in degree Farenheit) should be - 
Select and explain. 
A. Less tha 69, B. Between 69 and 76, C. Between 77 and 80, D. Between 81 and 82
B: Between 69 and 76
Answer: B: Between 69 and 76 
Explanation: Comfo zones: In deg C of corrected effective temperature Pleasant and cool 20 Comfoable and cool 20-25 (69-76F) Comfoable 25- 27 (77-80F) Hot and uncomfoable 27-28 Extremely hot 28+ Intolerably hot 30+. Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 792