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
Gas causing global warming but is not a greenhouse gas? 
Select and explain. 
A. CO2, B. SO2, C. CFC, D. Ozone
B: SO2
Answer: B: SO2 
Explanation: Greenhouse gases are CO2 Methane CFC 12 HCFC 22 Nitrous oxide Tetrafluoromethane SO2 is not a Greenhouse gas but it causes global warming Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 794