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
A Pt. is presented with a metallic foreign body in the eye. Which investigation should not be done: 
Select and explain. 
A. USG, B. X-ray, C. CT, D. MRI
D: MRI
Answer: D: MRI 
Explanation: None