A correct answer or right solution: the accurate response to a question or proper interpretation/solution.
テストで全問正解するのは難しい。
It's difficult to get all the answers correct on a test.
正解が発表されると、会場からため息が漏れた。
When the correct answers were announced, sighs went around the hall.
彼は問題の正解をすぐに書いた。
He wrote the correct answer immediately.
The right decision or appropriate judgement: a choice or decision considered suitable or correct in a given situation.
今回はそのプランを採用するのが正解だと思う。
I think adopting that plan is the right decision this time.
彼の選択は結果的に正解だった。
His choice turned out to be the right one.
何が正解かは状況によって変わることもある。
What is the right decision can sometimes change depending on circumstances.