Why is using a ct scan more useful to diagnose tinnitus than mri

"Doctors at NYU Langone may use one or more tests, such as an MRI scan, CT scan, or ultrasound, to assist with diagnosis. ... An MRI scan may reveal a growth or tumor near the ear or the eighth cranial nerve that could be causing tinnitus. Imaging tests can also help doctors evaluate pulsatile tinnitus"

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

i would say it is