The Main Difference Between Simultaneous and Concurrent Co-Use Is

The main difference between simultaneous and concurrent co-use is:

A) concurrent co-use refers to co-use of drugs within the past months at the same time
B) concurrent co-use refers to use of several drugs within the past months but never at the same time
C) simultaneous use of drugs refers to using alcohol and drugs sometimes but never at the same time
D) concurrent co-use is more prevalent than simultaneous use

Correct Answer:

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