どれ
which, what
ど- always marks the question. Five identical doors, no labels, and you still have to choose one of them: which? Door, どれ.
どれ picks one out of a set you can both see. 何 なに asks with nothing laid out.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.