Please select the eligibility criteria that correspond to the clinical trial below.
Title: A Cognitive Enhancer May Facilitate Behavioral Exposure Therapy for Veterans With PTSD
Brief Summary: This study will determine whether a combination of virtual reality exposure therapy and D-cycloserine will reduce post-traumatic stress disorder symptoms in Iraq war veterans.


Options:
A: Inclusion Criteria:

* Principal diagnosis of panic disorder

Exclusion Criteria:

* History of psychotic disorders or bipolar disorder
* Substance dependence
* Pregnant or breastfeeding
* History of a medical condition that may increase the risks of taking the study drug
B: Inclusion Criteria:

* Primary diagnosis of specific phobia (snakes)

Exclusion Criteria:

* History of psychosis, obsessive-compulsive disorder, or mania
* Recent substance abuse or suicidality
* Previous receipt of study treatments
C: Inclusion Criteria:

* Meets DSM-IV criteria for PTSD due to Iraq military trauma
* Speaks English
* Healthy overall

Exclusion Criteria:

* History of mania, schizophrenia, or other psychoses
* Suicidal
* Current alcohol or drug dependence
* Medication free within 2 weeks of study entry for any medication that has been taken less than daily for the past month and medicine free within 4 weeks of study entry for any anxiolytic medication that has been taken daily for the last month or more
* Pregnant
* Special medical conditions, such as kidney insufficiency, chronic diseases, or history of significant head injury
* Stabilized on potentially data obscuring medication such as glucocorticoids
D: Inclusion Criteria:

1. Male or female outpatients \> 18 years of age with a primary psychiatric diagnosis (designated by the patient as the most important source of current distress) of generalized social anxiety disorder (GSAD) as defined by DSM-IV criteria.
2. A total score \> 60 on the LSAS.
3. Physical examination, electrocardiogram, and laboratory findings without clinically significant abnormalities.
4. Willingness and ability to comply with the requirements of the study protocol.

Exclusion Criteria:

1. A lifetime history of bipolar disorder, schizophrenia, psychosis, delusional disorders or obsessive-compulsive disorder; an eating disorder in the past 6 months; organic brain syndrome, mental retardation or other cognitive dysfunction that could interfere with capacity to engage in therapy; a history of substance or alcohol abuse or dependence (other than nicotine) in the last 6 months or otherwise unable to commit to refraining from alcohol use during the acute period of study participation.
2. Patients with posttraumatic stress disorder within the past 6 months are excluded. Entry of patients with other mood or anxiety disorders will be permitted if the social anxiety disorder is judged to be the predominant disorder, in order to increase accrual of a clinically relevant sample. Patients with significant suicidal ideation (MADRS item 10 score \> 3) or who have enacted suicidal behaviors within 6 months prior to intake will be excluded from study participation and referred for appropriate clinical intervention.
3. Patients must be off concurrent psychotropic medication (e.g., antidepressants, anxiolytics, beta blockers) for at least 2 weeks prior to initiation of randomized treatment.
4. Significant personality dysfunction likely to interfere with study participation.
5. Serious medical illness or instability for which hospitalization may be likely within the next year.
6. Patients with a current or past history of seizures
7. Pregnant women, lactating women, and women of childbearing potential who are not using medically accepted forms of contraception (e.g., IUD, oral contraceptives, barrier devices, condoms and foam, or implanted progesterone rods stabilized for at least 3 months).
8. Any concurrent psychotherapy initiated within 3 months of baseline, or ongoing psychotherapy of any duration directed specifically toward treatment of the GSAD is excluded. Prohibited psychotherapy includes CBT or psychodynamic therapy focusing on exploring specific, dynamic causes of the phobic symptomatology and provides management skills. General supportive therapy initiated \> 3 months prior is acceptable.
9. Prior non-response to adequately-delivered exposure (i.e., as defined by the patient's report of receiving specific and regular exposure assignments as part of a previous treatment) will exclude participants from the study.
10. Patients with a history of head trauma causing loss of consciousness, seizure or ongoing cognitive impairment.
11. Patients receiving isoniazid.
12. Patients unable to understand study procedures and participate in the informed consent process.

Answer: C