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: Medicine
Treatment of tobacco addiction - a) Nicotine  b) Bupropion  c) Mecanylate  d) Dopamine  e) Adenine 
Select and explain. 
A. ab, B. bc, C. ac, D. ad
A: ab
Answer: A: ab 
Explanation: None