This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Air, Light, Sound, Housing, Radiation, Waste Disposal, Subject name: Social & Preventive Medicine
[{'content': 'Psychrometer is used to measure: \nSelect and explain. \nA. Humidity, B. Air velocity, C. Air temperature, D. Radiant heat', 'role': 'user'}, {'content': "Answer: A \nExplanation: AIR HUMIDITY Air humidity is moisture content of air Air humidity can be measured by: Dry and wet bulb thermometer Hygrometer- most widely used. Sling/ whirling psychrometer Assman psychrometer Assman psychrometer Air temperature: Six's maximum-minimum thermometer measures maximum & minimum air temperatures reached over a period of time.", 'role': 'assistant'}]