People often praise poems for their truth.
Conclusion
It's wrong to say that . (i.e. expressing something true does not contribute to the aesthetic merit of a poem)
Evidence
Most commonplace beliefs are true, and the basis of poetic excellence must be rare, not common.
Evaluate / Goal
We're being asked about the last sentence, which is a Premise, so we'll look for an answer that sounds like
(in Role questions, the Conclusion is only the last claim about 10% of the time. 90% of the time the last claim is part of the Support)