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: The Rock and Roll Hall Of Fame and Museum opened the nation's first major John Lennon retrospective Thursday (October 19) with a gala party attended by his widow, Yoko Ono. Sentence 2: Yoko Ono is John Lennon's widow.

1