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: John Lennon's widow, Yoko Ono, has topped the US dance chart at the age of 71 with a song supporting gay marriage. Sentence 2: Yoko Ono is John Lennon's widow.

1