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
Patient with a metallic foreign body in eye, which investigation is not done. 
Select and explain. 
A. MRI, B. USG, C. X-ray, D. CT
A: MRI
Answer: A: MRI 
Explanation: A i.e. MRI