Assertion: Tubular secretion removes foreign bodies ions and molecules from the body.
Reason: As much as 99 per cent of the material in the filtrate is reabsorbed from the body because of tubular secretion.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. if both assertion and reason are true but reason is not the correct explanation of assertion.
C. if assertion is true but reason is false
D. if both assertion and reason are false.

Explanation

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that "Tubular secretion removes foreign bodies, ions, and molecules from the body." This is a true statement because tubular secretion is a process that occurs in the nephron of the kidney, where certain substances that were not filtered out during glomerular filtration are actively secreted into the tubular fluid.

2. **Understanding the Reason**: The reason provided is that "As much as 99 percent of the material in the filtrate is reabsorbed from the body because of tubular secretion." This statement is misleading. While it is true that a significant amount of material is reabsorbed in the nephron, the figure of 99% is not accurate in the context of tubular secretion. Instead, the majority of reabsorption occurs in the proximal convoluted tubule and other parts of the nephron, but it is not directly due to tubular secretion.

3. **Evaluating the Truth of Each Statement**:
- The assertion is true because tubular secretion does indeed remove foreign substances and ions from the body.
- The reason is false because the statement about 99% reabsorption is incorrect in relation to tubular secretion.

4. **Conclusion**: Since the assertion is true and the reason is false, the correct answer is that the assertion is true but the reason is false.

### Final Answer:
- Assertion: True
- Reason: False
- Conclusion: Assertion is true but the reason is false.

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