From a Researcher's Point of View,the Biggest Drawback of Using

Multiple Choice

From a researcher's point of view,the biggest drawback of using PET scans is ___,but from a participant's point of view,the biggest disadvantage of having a PET scan is that ___.

A) it doesn't provide information about brain function; it costs a lot
B) it doesn't provide information about brain structure; the results aren't available for a few weeks
C) it only provides information about white matter; it is an extremely painful procedure
D) it takes a while to detect changes in brain activity; it requires injection of a harmless radioactive substance