- A Uric acid
- B Urea
- C Ammonia
- D CO2
Correct answer: B. Urea
Explanation: Urea is the main nitrogenous waste in humans, formed in the liver from ammonia (produced by deamination of amino acids).
Concept context
Nitrogenous waste, kidney structure, urine formation in the nephron, and hormonal regulation of excretion.
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