Which of the following statements is incorrect?

Options

A. Mammals have the ability to produce concentrated urine.
B. Counter current is due to the flow of filtrate in two limbs of Henle's loop in opposite direction
C. Henle's loop and vasa recta play a significant role in concentrating the urine.
D. Flow the filtrate through vasa recta also follow the counter current pattern.

Explanation

To determine which statement is incorrect regarding the excretory system and urine concentration, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Evaluate the First Statement:**
- **Statement:** Mammals have the ability to produce concentrated urine.
- **Analysis:** This statement is true. Mammals can produce concentrated urine due to their ability to utilize the counter-current mechanism in the nephron, specifically in the loop of Henle.

2. **Evaluate the Second Statement:**
- **Statement:** Counter current is due to the flow of filtrate in two limbs of Henle's loop in opposite directions.
- **Analysis:** This statement is also true. The loop of Henle consists of an ascending limb and a descending limb, where the flow of filtrate occurs in opposite directions, contributing to the concentration of urine.

3. **Evaluate the Third Statement:**
- **Statement:** Henle's loop and Vasa recta play a significant role in concentrating urine.
- **Analysis:** This statement is true as well. Both the loop of Henle and the vasa recta are crucial for urine concentration. The loop of Henle creates a concentration gradient, while the vasa recta maintains this gradient by its blood flow.

4. **Evaluate the Fourth Statement:**
- **Statement:** Flow of filtrate through vasa recta also follows the counter current pattern.
- **Analysis:** This statement is incorrect. The vasa recta does not have filtrate flowing through it; instead, it carries blood. The flow of blood in the vasa recta does follow a counter-current pattern, but it is not the flow of filtrate.

### Conclusion:
The incorrect statement is the fourth one: "Flow of filtrate through vasa recta also follows the counter current pattern."

---