I haven't followed the ongoing discussion, but it seems pretty obvious to me that the RCC does not teach RC's The Gospel. If it did they wouldn't think it's some kind of trick question.
ICor. 1:23 but we preach Christ crucified to the Jews a stumbling block and to the Greeks foolishness
To try and obfuscate the most basic tenant of Christianity only shows how they are lost and on the wrong side of the Cross.
It's not a trick question and it isn't hard, whether you follow the discussion or not.