<prompt> Retinitis pigmentosa is associated with all exceptUsher syndromeKornzweig syndromeKearns-Sayre syndromeMarfan syndrome  <response>: Marfan syndrome Marfan syndrome is characterised by Skeletal changes - Long extremities, arachnodactly spider fingers Ectopia lentis - Dislocation of lenses upwards temporally Aoic aneurysm Systemic conditions associated with retinitis pigmentosa RP- a.Laurence-Moon-Biedl syndrome - most commonly associated characterised by RP, obesity, hypogonadism, polydactyly mental defect. b. Ushers syndrome: RP labyrinthine deafness c.Bussen-Kornzweig disease Abetalipoproteinemia : RP, fat malabsorption, spinocerebellar degeneration, and acanthocytosis d.Kearns-Sayer syndrome: Mitochondria myopathy characterised by external ophthalmoplegia, lid ptosis, cardiac conduction block mild RP. e.Cockaynes syndrome: RP, progressive infantile deafness, dwarfism, mental retardation, nystagmus ataxia. f.Refsums syndrome: RP, peripheral neuropathy cerebellar ataxia. g.Hallgrens syndrome: RP, vestibulo-cerebellar ataxia, congenital deafness mental deficiency 