This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fundamentals in Radiology, Subject name: Radiology
Iopanoic acid is used in - 
Select and explain. 
A. Myelography, B. Bronchography, C. Hysterosalpingography, D. Cholecystography
D: Cholecystography
Answer: D: Cholecystography 
Explanation: Iopanoic acid : iodine containing contrast agent Hepatic excretion potent inhibitor of thyroid hormone release and also peripheral conversion. used in cholecystography and also in hypehyroidism as adjuvant therapy