This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Seedatives & Hyponotics, Subject name: Pharmacology
Drug used in Narcoanalysis is: 
Select and explain. 
A. Cocaine, B. Pethidine, C. Atropine, D. Scopalamine
D: Scopalamine
Answer: D: Scopalamine 
Explanation: Ref: Essentials of Medical Pharmacology by K.D. Tripat hi p. 109, 113.Explanation:Hyoscine (Scopalamine)Atropine substitute and quartemary ammonium compoundLess potent and longer acting than atropineUsed for esophageal and gastrointestinal spastic conditions.- Hyoscine has been used to produce sedation and amnesia during labour (twilight sleep) and to control maniacal states.- It had earned a reputation as a lie detector' during world war SI: its amnesic and depressant action was believed to put the subject 'off guard' in the face of sustained interrogation and sleep deprivation, so that he came out with the truth.