I once failed this question at a FAANG company. We were talking about a recent project that my company did with Pivotal. So like every project Pivotal does, we spent about one day a week dividing up the upcoming work into tiny pieces, then we spent the other four days pair programming by doing whatever the top task on the backlog was. Predictibly, on a team that had 3 pairs, this means I or my pair did about 1/3 of all things, distributed somewhat uniformly throughout the project.

"What parts are you solely responsible for?" 0 things, the same as everyone else who worked on this project! Wrong answer though.