Please select the eligibility criteria that correspond to the clinical trial below.
Title: A Twelve-Week, Double-Blind, Placebo-Controlled, Randomized, Multicenter Study With Follow-up Evaluating the Safety and Efficacy of Varenicline Tartrate ( CP-526,555) in Comparison to Zyban for Smoking Cessation
Brief Summary: The primary purpose of this study is to evaluate the safety and efficacy of varenicline given for a twelve week treatment period in comparison with placebo and Zyban for smoking cessation.


Options:
A: Eligible participants are:

* patients aged 18 years and older who currently smoke one or more cigarettes daily for 7 days, are motivated to quit i.e.: in the preparation stage of the stage-of-change model, able to communicate in Arabic or English and are willing and capable of attending the scheduled sessions at the study pharmacies.

Exclusion criteria are:

* use of other nicotine or tobacco products
* current use or use in the last 30 days of quit smoking aids or medications
* plan to leave Qatar in the next 12 months
* presence of any major medical condition that would prevent use of the nicotine replacement therapy including hypersensitivity to the products, history of or recent myocardial infarction, life-threatening arrhythmias, severe or worsening angina, uncontrolled hypertension and temporomandibular joint disease (in case of nicotine gum)
* pregnancy
* psychiatric illness or other debilitating condition that would interfere with participation in the study.
B: Inclusion Criteria:

* Must be U.S. Veteran
* Smoke at least ten cigarettes a day
* Meet criteria for current PTSD
* Speak and write fluent conversational English
* Be between 18 and 65 years of age
* Be willing to attempt smoking cessation
* Must have access to a phone capable of receiving text messages

Exclusion Criteria:

* Not stable on medications for the study period
* History of myocardial infarction in the past 6 months
* Contraindication to NRT and inability to get medical clearance from primary care provider
* Use of other forms of nicotine such as cigars, pipes, or chewing tobacco.
* Pregnancy
* Inability to complete study measures and tasks independently
* Dementia or other brain disorder, schizophrenia, current manic syndrome, or substance abuse/dependence in the preceding 3 months.
* Currently receiving trauma-focused psychotherapy.
* Currently living in court-ordered residential substance abuse treatment.
C: Inclusion Criteria:

* Subjects must have smoked an average of at least 10 cigarettes per day during the past year and over the month prior to the screening visit, with no period of abstinence greater than 3 months in the past year.

Exclusion Criteria:

* Subjects who have used bupropion (Zyban, or Wellbutrin) previously.
D: Inclusion Criteria:

* Women and men aged 18-70
* DSM-IV diagnosis of schizophrenia, schizoaffective disorder or bipolar disorder by diagnostic interview and chart review
* Smoke at least 10 cigarettes per day
* Clinically stable, on a stable dose of antipsychotic (schizophrenia) or mood stabilizer (bipolar) medication for at least 1 month
* No current active suicidal ideation
* Expired air carbon monoxide (CO) concentration \>9 ppm
* Willing to take study medications and set a quit date within 2-3 weeks of beginning treatment and be willing to participate in the relapse prevention and follow-up portions of the study
* Women of childbearing potential must have a negative urine pregnancy test at baseline and agree to use an approved form of contraception during the study.

Exclusion Criteria:

* DSM-IV diagnosis of dementia, neurodegenerative disease, or other organic mental disorder
* Substance use disorder other than nicotine or caffeine in the last 6 months
* Major depressive disorder within the last 6 months
* Serious unstable medical illness including, cardiovascular, hepatic, renal, respiratory, endocrine, neurological, or hematological disease such that hospitalization for treatment of that illness is likely within the next 2 months
* Life-threatening arrhythmia or cerebro-vascular event within 6 months, cardiovascular event within 2 months or uncontrolled hypertension
* History of multiple head injuries with neurological sequelae, a single severe head injury with lasting neurological sequelae, or current CNS tumor
* Liver function tests elevated over twice normal
* Renal insufficiency with estimated creatinine clearance \<40 ml/min
* Plan to continue use of tobacco products othe than cigarettes (e.g., cigar, pipe)
* Use of an investigational medication or device in the past 30 days
* Current suicidal or homicidal ideation

Answer: C