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: Ophthalmology
[{'content': 'Penetrating iron paicle in eye which of the following investigation will not be used ? \nSelect and explain. \nA. X- ray, B. CT scan, C. MRI, D. USG', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., MRI MRI is contraindicated in presence of metalic (magnetic) foreign body.", 'role': 'assistant'}]