Biology

Answer: B

Explanation:

Correct option: Kidneys act as a "cleaning factory" for blood.
They filter out waste products such as urea, excess salts, and water from the blood.
Each kidney contains millions of tiny filtering units called nephrons that perform this crucial filtration job.

Incorrect options:

Option A: The liver is mainly involved in processes like detoxifying harmful substances, producing bile for digestion, and metabolizing nutrients.
It doesn't directly filter the...