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
Contrast used in CT – 
Select and explain. 
A. Gadolinium, B. Technitium, C. Iodine, D. Chromium
C: Iodine
Answer: C: Iodine 
Explanation: Iodinated contrasts are the most commonly used radiocontrast media in radiography and CT.