Synonym of CONUNDRUM

Question : a sentence worded or expressed so as to elicit information.
Discussion : the action or process of talking about something in order to reach a decision or to exchange ideas.
Explanation : a statement or account that makes something clear.
Solution : a means of solving a problem or dealing with a difficult situation.
Conundrum : a question asked for amusement, typically one with a pun in its answer; a riddle.

Synonym of Conundrum is Question