Please select the eligibility criteria that correspond to the clinical trial below.
Title: A Randomized, Double-Blind, Placebo-Controlled Study to Assess the Efficacy and Safety of XP13512 in Patients With Restless Legs Syndrome.
Brief Summary: The primary objective of this trial is to assess the efficacy of XP13512 taken once daily compared to placebo for the treatment of patients suffering from Restless Legs Syndrome (RLS).


Options:
A: Inclusion Criteria:

* Men or women at least 18 years of age
* RLS, based on the IRLSSG Diagnostic Criteria
* History of RLS symptoms occurring at least 15 nights in the month prior to Screening or, if on RLS treatment, this frequency of symptoms must have been applicable prior to start of treatment
* Documented RLS symptoms for at least 4 of the 7 consecutive evenings/nights
* Total RLS severity score of 15 or greater on the IRLS Rating Scale
* If taking dopamine agonists, gabapentin, or other treatments for RLS (e.g., opioids, benzodiazepines) medications must have been discontinued at least 2 weeks prior to Screening;
* If taking any prescription medication, therapy must have been stabilized for at least 3 months prior to Screening with no anticipated changes for the duration of the study;
* Body Mass Index (BMI) of 34 or below
* estimated creatinine clearance of at least 60 mL/min

Exclusion Criteria:

* a sleep disorder (e.g., sleep apnea) that may significantly affect the assessment of RLS
* history of RLS symptom augmentation or end of dose rebound with previous dopamine agonist treatment
* neurologic disease or movement disorder (e.g., diabetic neuropathy, Parkinson's disease, multiple sclerosis, dyskinesias, and dystonias);
* other clinically significant or unstable medical condition or conditions which could affect RLS treatment efficacy assessments
* serum ferritin level below 20 ng/mL
* currently suffering from moderate or severe depression using the Diagnostic and Statistical Manual of Mental Disorders and Treatment IV (DSM IV TR)
B: Inclusion Criteria:

* Patients with primary RLS, based on the International RLS Study Group Diagnostic Criteria.
* History of RLS symptoms at least 15 nights in the prior month or, if on treatment, this frequency of symptoms before treatment was started;
* Documented RLS symptoms for at least 4 of the 7 consecutive evenings/nights during the Baseline study period;
* Total RLS severity score of 15 or greater on the International Restless Legs Syndrome Study Group Rating Scale (IRLS rating scale) at Visit 1 and at Visit 2;
* Discontinuation of dopamine agonists and/or gabapentin at least 2 weeks prior to Baseline;
* Discontinuation of other treatments for RLS (e.g., opioids, benzodiazepines) at least 2 weeks prior to Baseline;
* If female of child-bearing potential, the subject must agree to use clinically accepted birth control through completion of the study;
* Body Mass Index of 34 or below;
* Estimated creatinine clearance of at least 60 mL/min;

Exclusion Criteria:

* A sleep disorder (e.g., sleep apnea) that may significantly affect the assessment of RLS;
* Neurologic disease or movement disorder (e.g., diabetic neuropathy, Parkinson's Disease, Multiple Sclerosis, dyskinesias, and dystonias);
* Abnormal laboratory results, electrocardiogram (ECG) or physical findings;
* Pregnant or lactating women;
* Women of childbearing potential who are not practicing an acceptable method of birth control.
C: Inclusion Criteria:

* Clinically stable hemodialysis patients with positive diagnosis in IRLSS questionnaire for the RLS will be eligible to participate. Entry criteria included being on chronic hemodialysis for six months, able to perform an exercise training, with dialysis delivery (KT/V) \> 1.1.

Exclusion Criteria:

* Patients were excluded from the study if they were diagnosed with neuropathies or reasons for being in a catabolic state (including malignancies, HIV and opportunistic infections, active inflammation), within 3 months prior to the start of the study. In addition patients treated with drugs recommended for the treatment of RLS as well as patients with Parkinson's disease or untreated depression will be also excluded.
D: Inclusion Criteria:

* Patients with primary RLS, based on the International RLS Study Diagnostic Criteria.

Exclusion Criteria:

* A sleep disorder (e.g., sleep apnea) that may significantly affect the assessment of RLS;
* Neurologic disease or movement disorder (e.g., diabetic neuropathy, Parkinson's Disease, Multiple Sclerosis, dyskinesias, and dystonias);
* Abnormal laboratory results, electrocardiogram (ECG) or physical findings;
* Pregnant or lactating women;
* Women of childbearing potential who are not practicing an acceptable method of birth control.

Answer: B