This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: X-RAYS, Subject name: Radiology
Coventional X-ray film is made of? 
Select and explain. 
A. Silver chloride, B. Silver bromide, C. Silver nitrate, D. Gold chloride
B: Silver bromide
Answer: B: Silver bromide 
Explanation: *The Photosensitive material used in Xray film is Silver bromide *Double coated emulsions of silver halides,mainly silver bromide is used in conventional radiography. Silver halide is the lightsensitive material in the emulsion. The halide in medical x-ray film is about 90 to 99% silver bromide and about 1 to 10% silver iodide (the presence of Agi produces an emulsion of much higher sensitivity than a pure AgBr emulsion).