You haven't clarified what you mean by a discussion question. A discussion question can be understood as either a question for discussion amongst a group of people (for a class assessment) or a question requiring you to discuss the ideas in a text in relation to a particular area of the rubric. It is all a matter of how well you understand your texts and the discovery rubric and a matter of practice. For example, say if a question is discuss the importance of self-belief in discovering one's identity,
thesis 1 might be: self-belief is vital to facilitate the discovering of one's identity as it catalyses one's desire to proactively understand their cultural heritage.
Thesis 2 might be: Text 2 demonstrates in contrast that the importance of self-belief can be undermined by excessive reliance on hostile perceptions that barricades one from discovering their true identity.
Hope this helps a bit