Part 1. Definition
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'.
Part 2. Example
Premise: Lyme Disease is caused by a bacterium that's transmitted by tick bite, but many infected people don't remember a bite. 
 Hypothesis: Lyme disease is caused by bacteria.
Answer: entails
Explanation: The premise sentence agrees with the hypothesis that Lyme Disease is a bacterium. The premise also gives additional information about Lyme disease. Therefore Premise entails Hypothesis.
Part 3. Exercise
Premise: For long periods of drought it is necessary to store excessively large volumes of water. 
 Hypothesis: Because trees add water vapor to air, cutting down forests leads to longer periods of drought.
Answer:
neutral