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

To solve the question, we need to analyze the assertion and the reason provided.

### 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 true because tubular secretion is a process in the kidneys where substances that are not filtered out during glomerular filtration are actively secreted into the renal tubule from the blood. This includes foreign substances, excess ions, and metabolic waste.

2. **Understanding the Reason**:
- The reason states 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 filtrate (around 99%) is reabsorbed during the renal process, this reabsorption primarily occurs in the proximal convoluted tubule and other parts of the nephron, not because of tubular secretion. Tubular secretion is a separate process that removes substances from the blood into the tubule.

3. **Conclusion**:
- The assertion is true, but the reason is false. Therefore, the correct answer to the question is that the assertion is true, but the reason is false.

### Final Answer:
- Assertion: True
- Reason: False
- Correct Option: C