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
After taking a drug a patient developed some abdominal problem for which he consulted a physician, who adviced X-ray. X ray findings was radiopacity in bowel. Probably he might have taken A/E: 
Select and explain. 
A. Salicylate, B. Iron, C. Phenothiazine, D. Coicosteroid
D: Coicosteroid
Answer: D: Coicosteroid 
Explanation: D i.e. Coicosteroid