Answer:
D. Mri
Explanation: because a mri uses magnetic electro fields instead of a xray to view pictures of thee bodys anatomy and processes of the body.
This would definitely be true.
Over active bladder ( OAB )
Okay, this is an interesting one but mainly no, most activity's will so you don't push yourself but if you really wanted to you could go for however long you want as long as you are not doing harm to your body, depending if you are on a fitness program there will be limits.