Definition: In this task, you're given two sentences. Indicate if the first sentence clearly entails the second sentence (i.e., one can conclude the 2nd sentence by reading the 1st one). Indicate your answer with '1' if the first sentence entails the second sentence, otherwise answer with '0'.
Input: Sentence 1: Oil prices, notoriously vulnerable to political events, spiked as high as $40 a barrel during the Gulf War in 1991. Sentence 2: The Gulf War was fought in 1991.

1