Which organ in the human body is primarily responsible for the filtration of blood and removal of nitrogenous waste?

Correct answer: Kidney

Explanation: ✅ Correct Answer: C) Kidney 📚 Explanation: The kidneys contain millions of functional units called nephrons that filter blood to remove urea, salts, and excess water. This filtered waste is then excreted from the body in the form of urine. Beyond waste removal, the kidneys play a critical role in regulating blood pressure and maintaining the body's electrolyte balance.