In this task, you are given a sentence and question which can be answered using the sentence. Your task is to answer the question using the information from the sentence. The answer to the question is unique and it is a continuous text span from the sentence.

Sentence: `` Billboard '' ranked it as the No. 15 song for 1975 . 
 Question: what was  ranked?
it
The text span 'it' is the answer to the question..