<prompt> Fatal familial insomnia is associated with :Prion diseaseDegenerative diseaseNeoplastic diseaseVascular disease  <response>: Answer is A Prion Disease: Fatal familial insomnia is one of the commonly caused prion disease. PRIONS refer to a class of proteinacious infectious paicles without any detectable nucleic acid i.e. virus like paicles without the nucleic acid components. - Ananthnarayan 6th 416 As can be expected they are sensitive to proteasesQ contain protein but resistant to nucleasese do not contain nucleic acid as well as to heat UV rays. The most commonly caused prion diseases include: Kura Creutzfeildt - Jakob diseaseQ Gestermann - Straussler - Scheinker syndrome Q Fatal familial insomnia Q 