In this task, You are given an open-domain question that can be answered based on factual information. Your task is to provide \*short\* answer (in a few words only) for the given question. The short answer can be one or more entities or it can also be boolean \*yes\* or \*no\*.

[Q]: what is the first known polyphonic setting of all the sung movements of the mass ordinary
[A]: the Ivrea Codex


[Q]: why do you put fork marks on peanut butter cookies
[A]: convenience


[Q]: when did sri lanka leave the british empire
[A]:
February 4, 1948