Spot the correct spelling of microorganism-based pollution cleanup.

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1. **Definition:** Bioremediation means using microbes to clean pollution.
2. **Check (a):** It spells the word as **Bioremediation**, the standard form.
3. **Other options:** (b), (c) and (d) change letters or order and are wrong.
4. **Conclusion:** The correct choice is (a).

FINAL_ANSWER: <a>

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