Please select the eligibility criteria that correspond to the clinical trial below.
Title: A Phase 4, Multi-National, Randomized, Double-Blind, Placebo-Controlled Study To Evaluate The Efficacy And Safety Of Varenicline Compared To Placebo For Smoking Cessation Through Reduction
Brief Summary: This study will determine whether varenicline is safe and helps people to quit smoking through reduction when they are not willing/able to make an abrupt quit attempt.


Options:
A: Inclusion Criteria:

* Male and female cigarette smokers over the age of 18 years who are not willing/able to quit smoking within the next month but who are willing to attempt to reduce their smoking to work toward a quit attempt within the next 3 months.
* Subjects must have smoked an average of at least 10 cigarettes per day during the past year and during the month prior to the screening visit, with no continuous period of abstinence greater than 3 months in the past year and who have an exhaled carbon monoxide (CO) \>10 ppm at screening.
* Subjects with mild to moderate depression or anxiety may be included if their condition is stable.

Exclusion Criteria:

* Subjects with a history of a suicide attempt or any suicidal behavior in the past two years.
* Subjects with severe depression or anxiety.
* Subjects with psychosis, panic disorder, bipolar disorder, post traumatic stress disorder (PTSD), or schizophrenia.
* Subjects with alcohol or substance abuse or dependence (except nicotine) unless in full remission for at least 12 months.
B: Inclusion Criteria:

* Smoke 10 or more cigarettes per day
* Expired carbon monoxide (CO) level greater than 9 parts per million (ppm)
* Motivated to quit smoking (score of 3 on 4-point self-report scale)
* Willing to fulfill study requirements

Exclusion Criteria:

* Carbon monoxide breath test score below 9 ppm
* Serious psychopathology (bipolar disorder, psychosis)
* Center for Epidemiologic Studies Depression Scale CES-D)score over 16
* Contraindications for use of bupropion
* History of seizure disorder
* History of eating disorder
* Current heavy drinking
* Risk of pregnancy
* Current breastfeeding
C: Inclusion Criteria:

* Meets DSM-IV criteria for schizophrenia or schizoaffective disorder
* Receiving a stable dose of antipsychotic medication for at least 1 month prior to study entry
* Smokes at least 10 cigarettes per day
* Wishes to stop smoking
* Attended last three scheduled clinic visits, prior to study entry

Exclusion Criteria:

* Significant medical or neurologic illness
* History of severe head injury with loss of consciousness
* Treated with monoamine oxidase inhibitors or carbamazepine in the 14 days prior to study entry
* Taking clozapine at doses greater than 500 mg/d without an anticonvulsant
* Currently undergoing an acute exacerbation of psychotic symptoms
* Current or history of bulimia or anorexia
* Current excessive water intake
* Recent history of mania
* Known allergy or hypersensitivity to bupropion
* Current substance abuse other than tobacco, nicotine replacement treatment, or smokeless tobacco
* Currently receiving treatment with bupropion
* Pregnant or breastfeeding
D: Inclusion Criteria:

* Outpatients over the legal age smoking at least 10 cigarettes per day for at least 2 months

Exclusion Criteria:

* Insufficient level of motivation
* Another participant in the household
* Patients with current psychotic disorder or major depressive disorder

The investigator will evaluate whether there are other reasons why a patient may not participate.

Answer: A