This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nuclear medicine, Subject name: Radiology
CHA is used in Rx of? 
Select and explain. 
A. Ca Lung, B. Ca Stomach, C. Head and neck cancer, D. NHL
A: Ca Lung
Answer: A: Ca Lung 
Explanation: CHA is Continous Hyper fractionated accelerated Radiotherapy used for management of non-small cell lung cancer.