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
[{'content': 'Which gas is NOT responsible for green house affect- \nSelect and explain. \nA. Carbon monoxide, B. Ozone, C. Nitrous oxide, D. All', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Carnhon monoxide Green house effect o The greenhouse effect is the process by which absorption and emission of infrared radiation by gases in the atmosphere warm a planet's lower atmosphere and surface.", 'role': 'assistant'}]