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': 'Psychrometer is used to measure – \nSelect and explain. \nA. Humidity, B. Air velocity, C. Room temperature, D. Radiant temperature', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Humidity is measured by\n\nDry and wet Bulb hygrometer\nSling psychrometer\nAssmann psychrometer', 'role': 'assistant'}]