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: Dental
[{'content': 'Setting time is the elapsed time from the start of mixing to the point at which the needle no longer makes a discernible circular indentation in the cement. The standard parameters of defining setting time are all except: \nSelect and explain. \nA. Setting time should be measured with a 1-mm diameter needle indenter, B. Setting time should be measured at a load of 400 g, C. Setting time should be measured at a temperature of 37°C, D. Setting time should be measured at a relative humidity of less than 90%', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Setting time—The elapsed time from the start of mixing to the time at which the setting reaction essentially stops as measured by reaching a desired hardness or consistency; setting time can be measured with a 1-mm diameter needle indenter at a load of 400 g at a temperature of 37°C and a relative humidity greater than 90%.\nSetting time is the elapsed time from the start of mixing to the point at which the needle no longer makes a discernible circular indentation in the cement.\nRef: Phillip’s Science of Dental Materials ed 12 pg 308', 'role': 'assistant'}]