instruction:
In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.
question:
Where are sister chromatids attached to one another?
answer:
common centromere


question:
When did the washington capitals last win a stanley cup?
answer:
June 7, 2018


question:
An edge of a graph that joins a vertex to itself is called a?
answer:

self-loop