Read the following statements.
A. Nerve cells do not have the ability of regeneration.
B. Nerve cells are one kind of muscle tissue.
C. No two nerve cells have same appearance.
D. Nervous tissue is a fluid tissue.
Which of the following is true?

Options

A. A and B
B. C and D
C. A and C
D. B and D

Answer

To determine which statements about nerve cells and nervous tissue are true, let's analyze each statement one by one.

### Step 1: Analyze Statement A
**Statement A:** Nerve cells do not have the ability of regeneration.
- This statement is **true**. Nerve cells, or neurons, generally do not regenerate after injury. Once damaged, they cannot be replaced or repaired effectively.

### Step 2: Analyze Statement B
**Statement B:** Nerve cells are one kind of muscle tissue.
- This statement is **false**. Nerve cells are part of the nervous tissue, not muscle tissue. Muscle tissue includes types like skeletal, cardiac, and smooth muscle, which are distinct from nerve cells.

### Step 3: Analyze Statement C
**Statement C:** No two nerve cells have the same appearance.
- This statement is **true**. Neurons can vary significantly in shape, size, and structure depending on their function and location in the nervous system. Thus, it is accurate to say that no two nerve cells have the same appearance.

### Step 4: Analyze Statement D
**Statement D:** Nervous tissue is a fluid tissue.
- This statement is **false**. Nervous tissue is composed of neurons and glial cells and is not classified as a fluid tissue. Fluid tissues include blood, which is a connective tissue.

### Conclusion
Based on the analysis:
- Statement A is true.
- Statement B is false.
- Statement C is true.
- Statement D is false.

Therefore, the true statements are A and C.

### Final Answer
The true statements are A and C.