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: On September 21 , 1955 , Moore went up in weight to face future Hall of Famer Rocky Marciano for Marciano 's Heavyweight Championship . 
 Question: when did someone face someone?
Marciano 's Heavyweight Championship

Sentence: When BrdU is integrated into DNA , it is supposed that the bromine deforms the minor groove so that Hoechst dyes can not reach their optimal binding site . 
 Question: why does something deform something?
so that Hoechst dyes can not reach their optimal binding site

Sentence: If neither contestant has been eliminated before time runs out in round three , the contestant with the higher score is declared the champion , adds their opponent 's score to their own , and their opponent is dropped . 
 Question: when may someone be eliminated?

before time runs out in round three