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: Unknown
Varenicline is used in - 
Select and explain. 
A. Nicotine addiction, B. Alcohol addiction, C. Heroin addiction, D. LSD intoxication
A: Nicotine addiction
Answer: A: Nicotine addiction 
Explanation: Ans. is 'a' i.e. Nicotine addiction (ref: Information Technology for Addiction Recovery: Medicine)o Repeat from previous sessions.