Question: what country has a green flag with a red circle?
Answer: The national flag of Bangladesh (Bengali: বাংলাদেশের জাতীয় পতাকা, romanized: Bānlādēśēra jātīẏa patākā, pronounced [baŋlad̪eʃer dʒat̪io̪ pɔt̪aka]) was adopted officially on 17 January 1972. It consists of a red disc on top (similar to that on Japan's flag) of a green field.