Choose the correctly spelled term for the body’s 24-hour biological rhythm.

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1. The correct word is **circadian**. It means the body's $24$-hour biological clock.
2. The other options are misspellings: **Circedian** (wrong letters), **Circadiann** (extra n), **Circadain** (letters swapped).
3. So the proper spelling is **Circadian**.

FINAL_ANSWER: b

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