Which planet is the biggest planet

Answer: HD 100546 (read explanation for possibly 2nd answer)

Explanation: HD 100546 is an exoplanet-mean that it's outside our solar system, it is also likely that this a brown dwarf. HD 100546 is 316.4 light years from Earth; as time progresses it will shrink to the size of Jupiter, eventually. But if your asking inside our Solar System, the answer is Jupiter which to me is unliked considering that is like a 2nd grade question

Jupiter is the largest planet in our Solar System (not Quiper belt, extrasolar planets, etc.)