Please select the arm or intervention descriptions that belong to the clinical trial below.
Title: Varenicline Smoking Cessation Treatment for Methadone Maintenance Patients
Brief Summary: This randomized trial will evaluate whether varenicline directly observed therapy provided at a methadone clinic is more efficacious than self-administered varenicline for promoting smoking cessation and enhancing adherence.


Options:
A: Arm Label: Varenicline treatment as usual (TAU); Type: EXPERIMENTAL; Interventions: Drug: Varenicline | Arm Label: Varenicline directly observed therapy; Type: EXPERIMENTAL; Interventions: Drug: Varenicline | Intervention Type: DRUG; Name: Varenicline; Assigned to Arm(s): Varenicline directly observed therapy, Varenicline treatment as usual (TAU)
B: Arm Label: Bupropion; Type: EXPERIMENTAL; Interventions: Drug: Bupropion, Behavioral: Smoking Cessation Counseling | Arm Label: Varenicline; Type: EXPERIMENTAL; Interventions: Drug: Varenicline, Behavioral: Smoking Cessation Counseling | Arm Label: Placebo; Type: PLACEBO_COMPARATOR; Interventions: Drug: Placebo, Behavioral: Smoking Cessation Counseling | Intervention Type: DRUG; Name: Bupropion; Assigned to Arm(s): Bupropion | Intervention Type: DRUG; Name: Varenicline; Assigned to Arm(s): Varenicline | Intervention Type: DRUG; Name: Placebo; Assigned to Arm(s): Placebo | Intervention Type: BEHAVIORAL; Name: Smoking Cessation Counseling; Assigned to Arm(s): Bupropion, Placebo, Varenicline
C: Arm Label: Varenicline; Type: ACTIVE_COMPARATOR; Interventions: Drug: Varenicline | Arm Label: Placebo; Type: PLACEBO_COMPARATOR; Interventions: Drug: Placebo | Intervention Type: DRUG; Name: Placebo; Assigned to Arm(s): Placebo | Intervention Type: DRUG; Name: Varenicline; Assigned to Arm(s): Varenicline
D: Arm Label: Extended Brief Contact; Type: EXPERIMENTAL; Interventions: Drug: Varenicline, Behavioral: Initial Individual counseling, Behavioral: Check-ins with medical staff | Arm Label: Extended Health Education; Type: EXPERIMENTAL; Interventions: Drug: Varenicline, Behavioral: Initial Individual counseling, Behavioral: Extended Individual Counseling - Health Model | Arm Label: Extended Relapse Prevention plus varenicline; Type: EXPERIMENTAL; Interventions: Drug: Varenicline, Behavioral: Initial Individual counseling, Behavioral: Extended Individual Counseling - Relapse Prevention Model | Arm Label: Extended Relapse Prevention; Type: EXPERIMENTAL; Interventions: Drug: Varenicline, Behavioral: Initial Individual counseling, Behavioral: Extended Individual Counseling - Relapse Prevention Model | Intervention Type: DRUG; Name: Varenicline; Assigned to Arm(s): Extended Brief Contact, Extended Health Education, Extended Relapse Prevention, Extended Relapse Prevention plus varenicline | Intervention Type: BEHAVIORAL; Name: Initial Individual counseling; Assigned to Arm(s): Extended Brief Contact, Extended Health Education, Extended Relapse Prevention, Extended Relapse Prevention plus varenicline | Intervention Type: BEHAVIORAL; Name: Check-ins with medical staff; Assigned to Arm(s): Extended Brief Contact | Intervention Type: BEHAVIORAL; Name: Extended Individual Counseling - Health Model; Assigned to Arm(s): Extended Health Education | Intervention Type: BEHAVIORAL; Name: Extended Individual Counseling - Relapse Prevention Model; Assigned to Arm(s): Extended Relapse Prevention, Extended Relapse Prevention plus varenicline

Answer: A