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\*.

who played in the men's semi final in wimbledon in 2015
Novak Djokovic

who plays sister bernadette on call the midwife
Laura Main

who sings everybody is working for the weekend

Loverboy

