Largest cell is

Options

A. Egg of Ostrich
B. RBC
C. WBC
D. Mesophyll cell

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the largest cell. This implies we need to compare the sizes of different cells mentioned in the options.

2. **Identifying the Options**: The options provided are:
- A) Egg of ostrich
- B) Red Blood Cells (RBC)
- C) White Blood Cells (WBC)
- D) Mesophilic cells

3. **Analyzing Each Option**:
- **Option A: Egg of Ostrich**: The size of an ostrich egg ranges from 130 mm to 170 mm.
- **Option B: Red Blood Cells (RBC)**: The size of RBCs ranges from 0.006 mm to 0.008 mm.
- **Option C: White Blood Cells (WBC)**: The size of WBCs ranges from 0.012 mm to 0.015 mm.
- **Option D: Mesophilic Cells**: The size of mesophilic cells ranges from 0.0012 mm to 90 mm.

4. **Comparing Sizes**:
- The ostrich egg is significantly larger than all the other options.
- RBCs and WBCs are much smaller, with sizes in the range of micrometers (mm) rather than millimeters (mm).
- Mesophilic cells can vary in size but do not exceed the size of an ostrich egg.

5. **Conclusion**: Based on the size comparisons, the largest cell among the options is the egg of an ostrich.

6. **Final Answer**: The largest cell is the egg of the ostrich (Option A).

---