Please select the arm or intervention descriptions that belong to the clinical trial below.
Title: Varenicline Versus Nicotine Replacement for Methadone-Maintained Smokers
Brief Summary: RATIONALE: Varenicline, the nicotine patch, and nicotine gum help people stop smoking. It is not yet known whether varenicline is more effective than the nicotine patch given together with nicotine gum in helping smokers quit smoking.

PURPOSE: This randomized clinical trial is studying varenicline to see how well it works compared with the nicotine patch given together with nicotine gum in helping smokers in a methadone treatment program stop smoking.


Options:
A: Arm Label: Varenicline; Type: EXPERIMENTAL; Interventions: Drug: Varenicline | Arm Label: Placebo; Type: PLACEBO_COMPARATOR; Interventions: Drug: Placebo | Intervention Type: DRUG; Name: Varenicline; Assigned to Arm(s): Varenicline | Intervention Type: DRUG; Name: Placebo; Assigned to Arm(s): Placebo
B: Arm Label: Arm I; Type: EXPERIMENTAL; Interventions: Drug: varenicline | Arm Label: Arm II; Type: PLACEBO_COMPARATOR; Interventions: Other: placebo | Arm Label: Arm III; Type: ACTIVE_COMPARATOR; Interventions: Drug: nicotine | Intervention Type: DRUG; Name: nicotine; Assigned to Arm(s): Arm III | Intervention Type: DRUG; Name: varenicline; Assigned to Arm(s): Arm I | Intervention Type: OTHER; Name: placebo; Assigned to Arm(s): Arm II
C: Arm Label: Varenicline; Type: EXPERIMENTAL; Interventions: Drug: Varenicline | Arm Label: Placebo; Type: PLACEBO_COMPARATOR; Interventions: Drug: Placebo | Intervention Type: DRUG; Name: Varenicline; Assigned to Arm(s): Varenicline | Intervention Type: DRUG; Name: Placebo; Assigned to Arm(s): Placebo
D: Arm Label: Nicotine Replacement Therapy Responder; Type: ACTIVE_COMPARATOR; Interventions: Drug: Nicotine Patches | Arm Label: Pre-Quit Rescue to Bupropion & Nicotine; Type: ACTIVE_COMPARATOR; Interventions: Drug: Nicotine patches, then bupropion & nicotine patches (Pre-Quit) | Arm Label: Pre-Quit Rescue to Varenicline; Type: ACTIVE_COMPARATOR; Interventions: Drug: Nicotine patches, then varenicline (Pre-Quit) | Arm Label: Pre-Quit Rescue to Nicotine; Type: ACTIVE_COMPARATOR; Interventions: Drug: Nicotine patches, then nicotine patches (Pre-Quit) | Arm Label: Post-Quit Rescue to Bupropion & Nicotine; Type: ACTIVE_COMPARATOR; Interventions: Drug: Nicotine patches, then bupropion & nicotine patches (Post-Quit) | Arm Label: Post-Quit Rescue to Varenicline; Type: ACTIVE_COMPARATOR; Interventions: Drug: Nicotine patches, then varenicline (Post-Quit) | Arm Label: Post-Quit Rescue to Nicotine; Type: ACTIVE_COMPARATOR; Interventions: Drug: Nicotine patches, then nicotine patches (Post-Quit) | Intervention Type: DRUG; Name: Nicotine Patches; Assigned to Arm(s): Nicotine Replacement Therapy Responder | Intervention Type: DRUG; Name: Nicotine patches, then bupropion & nicotine patches (Pre-Quit); Assigned to Arm(s): Pre-Quit Rescue to Bupropion & Nicotine | Intervention Type: DRUG; Name: Nicotine patches, then varenicline (Pre-Quit); Assigned to Arm(s): Pre-Quit Rescue to Varenicline | Intervention Type: DRUG; Name: Nicotine patches, then nicotine patches (Pre-Quit); Assigned to Arm(s): Pre-Quit Rescue to Nicotine | Intervention Type: DRUG; Name: Nicotine patches, then bupropion & nicotine patches (Post-Quit); Assigned to Arm(s): Post-Quit Rescue to Bupropion & Nicotine | Intervention Type: DRUG; Name: Nicotine patches, then varenicline (Post-Quit); Assigned to Arm(s): Post-Quit Rescue to Varenicline | Intervention Type: DRUG; Name: Nicotine patches, then nicotine patches (Post-Quit); Assigned to Arm(s): Post-Quit Rescue to Nicotine

Answer: B