A CAT scan uses X rays to build up a picture, while a MRI uses a magnetic field to do the same. MRI has no known side effects related to radiation exposure.MRI has also much higher detail in the soft tissues.
However, CT usually is more widely available, faster, much less expensive. From the given options the following is an advantage of an MRI over a CT scan: it is safer. Correct answer: B (There are no known side effects related to radiation exposure.)
