答
トウ, こた.える, こた.え, どう

solution, answer

JLPT4 G2 S12 F486

As per 合# (press/fit together) + 竹 bamboo → fit/fasten a cover upon a bamboo vessel → *answer*; *solve* (← answer/solution that corresponds to a question ← lid that corresponds to a container) → *repay*; *reward* (← make a fitting return).

[Full Kanji Etymology List]