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
Investigation of choice in parathyroid pathology is: 
Select and explain. 
A. CT scan, B. Gallium scan, C. Thallium scan, D. Technetium-thallium subtraction scan
D: Technetium-thallium subtraction scan
Answer: D: Technetium-thallium subtraction scan 
Explanation: Ans. Technetium-thallium subtraction scan