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
Parathyroid gland can he assessed by: 
Select and explain. 
A. Thallium scan, B. Technetium scan, C. Gallium scan, D. Thallium technetium substraction scan
D: Thallium technetium substraction scan
Answer: D: Thallium technetium substraction scan 
Explanation: Ans. Thallium technetium substraction scan