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
[{'content': '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: \nSelect and explain. \nA. Salicylate, B. Iron, C. Phenothiazine, D. Coicosteroid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Coicosteroid', 'role': 'assistant'}]