The Client Comes to the Emergency Department and Tells the Nurse,"I

The client comes to the emergency department and tells the nurse,"I have been off my drugs for three days." The nurse assesses the client for withdrawal symptoms associated with the category of drug used.Withdrawal from which drug,if taken by the client,should cause the nurse the most concern?

A) Cocaine
B) Marijuana
C) Heroin
D) Secobarbital