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
Penetrating iron paicle in eye which of the following investigation will not be used ? 
Select and explain. 
A. X- ray, B. CT scan, C. MRI, D. USG
C: MRI
Answer: C: MRI 
Explanation: Ans. is 'c' i.e., MRI MRI is contraindicated in presence of metalic (magnetic) foreign body.