You are given two sentences. You have to find if there is entailment or agreement of the Hypothesis by the Premise. From the given pair of sentences, you should identify if there is enough information in the Premise to support the claim made in the Hypothesis. The Premise may not exactly be the same as Hypothesis. Your task is to return 'entails' if the premise supports hypothesis else return 'neutral'.

Premise: When blood vessels constrict, the flow of blood is restricted or decreased, thus retaining body heat or increasing vascular resistance. 
 Hypothesis: Blood flow decrease when blood vessels constrict.
entails