Answer:
Paradox
Explanation:
The definition of paradox is "a seemingly absurd or self-contradictory statement or proposition that when investigated or explained may prove to be well founded or true."
The definition of oxymoron is "a figure of speech in which apparently contradictory terms appear in conjunction (e.g. faith unfaithful kept him falsely true )."
Paradox seems to fit the question more properly.
