<prompt> In Raynauds phenomenon which of the following change is seen in vessels in initial stage?No changeThrombosisFibrinoid necrosisHyaline sclerosis  <response>: Raynaud phenomenon results from the exaggerated vasoconstriction of aeries and aerioles in the extremities, paicularly in the fingers and toes. The restricted blood flow induces paroxysmal pallor or cyanosis; involved digits characteristically show red-white -and-blue color change most proximal to most distal Robbins 9 th edition page no. 355 