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
True about MRI are all except 
Select and explain. 
A. Not helpful in a breast implant, B. Not good for calcified lesions, C. No radiation exposure, D. Contraindicated in cardiac pacemaker
A: Not helpful in a breast implant
Answer: A: Not helpful in a breast implant 
Explanation: "MRI should be used (with mammography and ultrasound) to investigate any nodular change near a breast implant to determine whether it is caused by a tumor or by silicon leak"