Step 1: Understanding the loop of Henle.
The loop of Henle is a U-shaped part of the nephron in the kidney. It plays an essential role in the process of filtering and concentrating urine. The loop is responsible for creating a concentration gradient that helps in water reabsorption.
Step 2: Analyzing the options.
(A) Spleen: This is incorrect. The spleen is involved in filtering blood, not in the formation of urine.
(B) Lung: The lungs are involved in gas exchange, not in the process of filtration or excretion.
(C) Kidney: Correct — The loop of Henle is found in the kidney, which is involved in filtering blood and forming urine.
(D) Gall bladder: The gall bladder stores bile, not involved in the formation of urine.
Step 3: Conclusion.
The correct answer is (C) Kidney because the loop of Henle is part of the nephron in the kidney.