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
All isotopes are used for thyroid except: 
Select and explain. 
A. 1-131, B. 1-123, C. 1-122, D. All
C: 1-122
Answer: C: 1-122 
Explanation: C i.e. 1-122