Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: Cleaning groundwater in an aquifer requires bioremediation or chemical remediation. Bioremediation uses microorganisms to consume a pollutant. Chemical remediation destroys the contaminant. Answer: bioremediation
What do you call a process that uses microorganisms to consume a pollutant?