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: Radiology
In a modern rotatory anode X-ray tube cooling of anode is done by: 
Select and explain. 
A. Conduction, B. Convection, C. Radiation, D. All of the above
C: Radiation
Answer: C: Radiation 
Explanation: Ans. Radiation