Currently,taking Drugs (Such as Benemid and Epitestosterone)to Mask the Presence

Multiple Choice

Currently,taking drugs (such as benemid and epitestosterone) to mask the presence of other drugs is seldom done because __________.

A) drugs such as benemid and epitestosterone are now Schedule I drugs,so their availability is very low
B) both drugs are easily detected by GC/MS tests
C) drugs such as benemid and epitestosterone may mask presence of other drugs in EIA testing,but not with GC/MS testing
D) drugs such as benemid and epitestosterone are not able to fully mask the presence of other drugs