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\*.

where does the surname janse van rensburg come from
South African

what country has a black yellow and orange flag
Belgium

britain and france declare war on germany when

after German forces invaded Poland