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
The technique employed in radiotherapy to counteract the effect of tumour motion due to breathing is known as – 
Select and explain. 
A. Arc technique, B. Modulation, C. Gating, D. Shunting
C: Gating
Answer: C: Gating 
Explanation: Respiratory gating is one of the latest techniques in radiation therapy and involves matching radiation treatment to a patient own respiratory pattern.