正解

1. Origins, structure, and basic meaning

• Structure: 正解(せいかい) is a noun for the correct answer to a problem or question.
• Basic usage: Knowing the answer appears in 正解が分かる, while reaching it through thought appears in 正解にたどり着く.

2. Common pitfalls and similar expressions

• Response and correct answer
  • It does not refer to just any response; it focuses on the answer that meets the problem's standard.
• Particle choice
  • Use 正解が for what is known and 正解に when the answer is the destination reached.