<prompt> Antibody shown to be useful for Crohns Disease is:OmalizumabPalivizumabNatalizumabNone of the above  <response>: Answer is C Natalizumab Natalizumab is a monoclonal antibody shown to be useful .far Crohns Disease. Natalizumab is a recombinant humanized immunoglobulin G4 Antibody IgG4 Monoclonal Antibody against alpha 4 integrins that is effective in the induction and maintenance of remission in Crohns Disease patients. It has been approved for the treatment of patients with Crohns disease refractory to intolerant to anti-TNF Therapy. Omalizumab is used for Bronchial Asthma Allergic Bronchial Asthma Palivizuntab is used in infection with Respiratory Syncytial Virus RSV Note Natalizumab therapy has been associated with the development of multifocal leukoencephalopathy, a predominantly fatal infection of the central nervous system by the JC polyomavius. This risk appears to be I in 1,000 patients, paicularly those receiving treatment with several immunosuppressive agents. 