Please select the eligibility criteria that correspond to the clinical trial below.
Title: A Phase IIIb, Double-Blind, Placebo-Controlled, Multicenter, Parallel Group, Extension Trial to Evaluate the Safety and Tolerability of Oral Cladribine in Subjects With Relapsing-Remitting Multiple Sclerosis Who Have Completed Trial 25643 (CLARITY)
Brief Summary: The purpose of this extension trial was to further evaluate the safety and tolerability of oral cladribine in subjects who have previously completed treatment within Trial 25643 (CLARITY). This trial also explored clinical benefit of prolonged 192-week versus 96-week treatment.


Options:
A: Inclusion Criteria:

* Randomized in Trial 25643 and satisfied one of the following:

  * Completed randomized treatment course and scheduled visits for the full 96 weeks; or
  * Did not complete the randomized treatment course in Trial 25643 but elected to receive rescue treatment with Rebif®, another beta-interferon, or glatiramer acetate and completed scheduled clinic visits for the full 96 weeks; or
  * Did not complete the randomized treatment course in Trial 25643, declined rescue with Rebif®, another beta-interferon, or glatiramer acetate and still completed scheduled clinic visits for the full 96 weeks; or
  * Did not complete the randomized treatment course in Trial 25643, were not eligible for rescue option with Rebif®, and still completed scheduled clinic visits for the full 96 weeks
* Male or female, between 18 and 65 years of age (inclusive, at time of informed consent for Trial 25643)
* No medical history or evidence of latent tuberculosis infection (LTBI) or tuberculosis (TB), as evidenced by TB skin test or chest X-ray
* All of the following laboratory hematologic parameters evaluated as normal (as define below, inclusively) within 28 days of first dosing of blinded study medication at study Day 1:

  * Hemoglobin = 11.6 to 16.2 gram per deciliter (g/dL)
  * Leukocytes (total white blood cell) = 4.1 to 12.3\*10\^3 per microliter
  * Absolute lymphocyte count (ALC) = 1.02 to 3.36\*10\^3 per microliter
  * Absolute neutrophil count (ANC) = 2.03 to 8.36\*10\^3 per microliter
  * Platelet count = 140 to 450\*10\^3 per microliter
* Other protocol-defined inclusion/exclusion criteria may apply

Exclusion Criteria:

* Participants who were not enrolled in Trial 25643
* Participant has moderate to severe renal impairment
* Use of mitoxantrone, total lymphoid irradiation, myelosuppressive therapy, campath-1h, cyclophosphamide, azathioprine, methotrexate or natalizumab at any time during and since Trial 25643
* Use of cytokine or anti-cytokine therapy, intravenous immunoglobulin (IVIG) or plasmapheresis at any time during and since Trial 25643
* Treatment with oral or systemic corticosteroids or adrenocorticotropic hormone within 28 days before Study Day 1
B: Inclusion Criteria:

General

1. sign written informed consent prior to participating in the study
2. 25 through 65 years of age inclusive
3. females of childbearing potential must:

   * have a negative pregnancy test at Baseline (prior to randomization) and
   * use simultaneously two forms of effective contraception during the treatment and 3-months after discontinuation of study medication

Primary Progressive Multiple sclerosis.

1. diagnosis of primary progressive multiple sclerosis (according to the 2005 Revised McDonald criteria):
2. time since first reported symptoms between 2 and 10 years
3. evidence of clinical disability progression in the 2 years prior to Screening
4. disability status at Screening

   * EDSS score of 3.5-6.0 inclusive
   * pyramidal functional system score of 2 or more
   * 25'TWT less than 30 seconds

Extension study Inclusion criteria

* Patients initially randomized to fingolimod 1.25 mg or placebo as part of the first study cohort, were to have completed at least 3 years on study drug treatment at the time of extension study initiation.
* Patients initially randomized to fingolimod 0.5 mg or placebo as part of the second study cohort, were to have continued on study drug treatment until such time as the last ongoing patient enrolled in the study had reached 3 years in study

Exclusion Criteria:

PPMS specific:

* History of relapses/attacks
* Progressive neurological disorder other than PPMS
* Pure cerebellar syndrome or pure visual progressive syndrome or pure
* cognitive progressive syndrome
* Presence of spinal cord compression at screening MRI
* Relevant history of vitamin B12 deficit
* Evidence of syphilis or borreliosis at Screening

Cardiovascular conditions:

* Myocardial infarction within the past 6 months or current unstable ischemic heart disease
* History of angina pectoris due to coronary spasm or history of Raynaud's phenomenon
* Severe cardiac failure or cardiac arrest
* History of symptomatic bradycardia
* Resting pulse \<55 bpm pre-dose
* History of sick sinus syndrome or sino-atrial heart block
* History or presence of second and third degree AV block or an increase QT interval (QTc\>440 ms)
* Arrythmia requiring treatment with class III antiarrythmic drugs
* History of positive tilt test from workout of vasovagal syncope
* Hypertension, not controlled with medication

Pulmonary:

* Severe respiratory disease or pulmonary fibrosis
* TB
* Abnormal X-ray, suggestive of active pulmonary disease
* Abnormal PFT: \<70% of predicted for FEV1 and FVC; \<60% for DLCO
* Patients receiving chronic (daily) therapies for asthma

Hepatic:

* Known history of alcohol abuse, chronic liver or biliary disease
* Total or conjugated Brb \>ULN, unless in context of Gilbert's syndrome
* AP \>1.5xULN; ALT/AST \>2xULN; GGT\>3xULN

Other:

* History of chronic disease of the immune system other than MS
* Malignancy (other than successfully treated SCC or BCC)
* Diabetes Mellitus
* Macular Edema present at screening
* HIV, Hepatitis C or B, other active infection
* History of total lymphoid irradiation or bone marrow transplantation
* Serum creatinine \>1.7 mg/dl
* WBC \<3500 cells/mm3
* Lymphocyte count \<800 cells/mm3
* History of substance abuse or any other factor that may interfere with subject ability to cooperate and comply with the study procedures
* Unable to undergo MRI scans
* Participation in any therapeutical clinical research study in the 6 months prior to randomization
* Pregnant or lactating women
* Drugs requiring wash-out period:

  3 months:
  * Systemic corticosteroids or ACTH
  * INF-beta

    6 months:
  * Immunosuppressive medication
  * Immunoglobulins
  * Monoclonal antibodies
* Drugs that exclude participation in the study:
* Cladribine
* Cyclophosphamide
* Mitoxantrone (except: patients who received a cumulative dose of no more than 60mg/m2 more than 5 years ago could enter the study)

Extension study Exclusion criteria

-Patients were not eligible for enrollment in the extension study if they had any of the following key exclusion criteria at the extension study Baseline visit: active chronic immune system disease other than MS (or stable disease treated with immune therapy); known immunodeficiency syndrome; active infection; uncontrolled diabetes mellitus; macularedema; treatment with Class Ia or III antiarrhythmic drugs; any of the specified cardiac, pulmonary, or hepatic conditions; or any medically unstable condition
C: Key Inclusion Criteria:

* Must have a confirmed diagnosis of relapsing multiple sclerosis (RMS), as defined by McDonald criteria 1 through 4 (Polman, 2005)
* Must have an EDSS score between 0.0 and 5.0.
* Must have experienced at least 2 relapses that have been medically documented within the last 3 years with at least one occurring in the last 12 months

Key Exclusion Criteria:

* Other chronic disease of immune system, malignancies, urologic, pulmonary, gastrointestinal disease
* Pregnant or nursing women
* Prior treatment with interferon could not exceed 4 weeks and subjects must have discontinued interferon treatment 6 months prior to Baseline

NOTE: Other protocol defined Inclusion/Exclusion criteria may apply.
D: Inclusion Criteria:

* Participants must have a confirmed and documented multiple sclerosis (MS) diagnosis as defined by the Revised McDonald criteria, with relapse onset disease or a relapsing-remitting disease course.
* Participants must be ambulatory with Kurtzke's expanded disability status scale (EDSS) score of 0 to 5.5 in both screening and randomization visits.
* Participants must be in a stable neurological condition, relapse-free and free of any corticosteroid treatment \[intravenous (IV), intramuscular (IM) and/or per os (PO)/oral\] or adrenocorticotrophic hormone, 60 days prior to randomization.
* Participants must have experienced at least one documented relapse in the 12 months prior to randomization.
* Participants must have disease duration of not more than 15 years.
* Women of child-bearing potential (for example, women who are not postmenopausal or surgically sterilized) must practice an acceptable method of birth control for 30 days before taking the study drug and two acceptable methods of birth control during the duration of the study and until 30 days after the last dose of study medication.

  * Additional criteria apply, please contact the investigator for more information.

Exclusion Criteria:

* Participants with progressive forms of MS.
* Participants with neuromyelitis optica.
* Use of experimental or investigational drugs and/or participation in drug clinical studies within the 6 months prior to randomization.
* Use of immunosuppressive agents or cytotoxic agents, including cyclophosphamide, within 6 months prior to randomization.
* Use of either of the following within 2 years prior to randomization visit: natalizumab (Tysabri®), rituximab, ocrelizumab, atacicept, belimumab, or ofatumumab.
* Use of teriflunomide (Aubagio®) within 2 years prior to randomization, except if active washout (with either cholestyramine or activated charcoal) was done 2 months or more prior to randomization.
* Previous treatment with glatiramer acetate (Copaxone®) Interferon β (either 1a or 1b), fingolimod (Gilenya®), dimethyl fumarate (Tecfidera®) or intravenous immunoglobulins within 2 months prior to randomization.
* Chronic (more than 30 consecutive days) systemic (IV, IM or PO) corticosteroid treatment within 2 months prior to randomization.
* Previous use of mitoxantrone (Novantrone®), cladribine, or alemtuzumab (Lemtrada®).
* Previous use of laquinimod.
* Previous total body irradiation or total lymphoid irradiation.
* Previous stem cell treatment, autologous bone marrow transplantation or allogenic bone marrow transplantation.
* Use of moderate/strong inhibitors of cytochrome P450 (CYP) 3A4 within 2 weeks prior to randomization.
* Use of inducers of CYP3A4 within 2 weeks prior to randomization visit.
* Pregnancy or breastfeeding.
* A known history of sensitivity to gadolinium (Gd).
* Inability to successfully undergo magnetic resonance imaging (MRI) scanning.
* Participants who underwent endovascular treatment for chronic cerebrospinal venous insufficiency within 3 months prior to randomization.

  * Additional criteria apply, please contact the investigator for more information.

Answer: A