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: Physiology
When an individual is resting in a room with the air temperature 21°C and the humidity of 80%, the greatest amount of heat loss from the body is by 
Select and explain. 
A. Elevation of body metabolism, B. Vaporisation of sweat, C. Respiration, D. Radiation and conduction
D: Radiation and conduction
Answer: D: Radiation and conduction 
Explanation: The most important mechanism for heat loss when the environmental temperature is higher than the body temperature- Sweating
The most important mechanism for heat loss when the environmental temperature is lower than the body temperature- Radiation and conduction