The Physician Orders an MRI for a Man Who Is

The physician orders an MRI for a man who is suspected of having a brain tumor. Which of the following is the most important question to ask this patient before scheduling an appointment?

A) "Have you had any recent illnesses?"
B) "Are you allergic to any drugs?"
C) "Do you have any metal implants?"
D) "How many children have you fathered?"
E) "Do you take any prescription medications?"