Urine formation occurs in
(a) Liver
(b) Kidneys
(c) Spleen
(d) Heart

Options

A. Liver
B. Kidneys
C. Spleen
D. Heart

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks where urine formation occurs in the body. We need to identify the correct organ from the given options.

2. **Analyzing the Options:**
- **(a) Liver:** The liver is involved in the formation of urea through the urea cycle but does not produce urine.
- **(b) Kidneys:** The kidneys are the primary organs responsible for urine formation. They filter blood, remove waste products, and excrete them as urine.
- **(c) Spleen:** The spleen is part of the lymphatic system and is involved in filtering blood and recycling red blood cells, not in urine formation.
- **(d) Heart:** The heart is a circulatory organ that pumps blood throughout the body and does not participate in urine formation.

3. **Identifying the Correct Answer:**
Based on the analysis, the only organ that is responsible for urine formation is the kidneys. Therefore, the correct answer is **(b) Kidneys**.

4. **Conclusion:**
Urine formation occurs in the kidneys, which contain nephrons that filter blood and produce urine.