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: Psychiatry
All of the following psychotropic drugs have abuse liability, EXCEPT: 
Select and explain. 
A. Methylphenidate, B. Buprenorphine, C. Dextro-propoxyphene, D. Escitalopram
D: Escitalopram
Answer: D: Escitalopram 
Explanation: Escitalopram is an SSRI and it does not cause addiction or habbit formation. Hence it does not have abuse potential. Methylphenidate is a stimulant belonging to the class of Amphetamines. It has an abuse potential and is usually a controlled drug. Buprenorphine is a semi-synthetic opiod and Dextro-propoxyphene is an analgesic of opiod category. Both the opiods have an abuse potential as they can cause drug dependence.