This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Which of the following drug is commonly used in narcoanalysis ? 
Select and explain. 
A. Atropine sulfate, B. Scopolamine hydrochloride, C. Phenobarbitone, D. Morphine
B: Scopolamine hydrochloride
Answer: B: Scopolamine hydrochloride 
Explanation: Controlled administration of intravenous hypnotics to obtain information from subjects who are unable or unwilling to provide it otherwise, is known as Narcoanalysis or Narcosynthesis.
Drugs used for narcoanalysis are:

Ethanol
Scopolamine
Temazepam
Barbiturates like Thiopentone and Amobarbital

These drugs are also known as truth drug or truth serum.

Phenobarbitone is not used, rather amobarbital is used for narcoanalysis.