Answer: Truth of reason is relevant to establishing the truth of claim
Explanation: The truth of a conclusion is may not necessarily be dependent on the supporting evidences or points used in making such conclusion or a times, the supporting points may not align or be applicable to the conclusion being made. In cases like this, conclusions whose truth still holds are just too valid to dispute and could be seen as having a very general notion. Therefore, In arguments the truth behind a taking a particular side should is very relevant in establishing or nailing one's claim or notion.