Mark the name of the appropriate stain which is used to identify DNA as orange strands under U.V light :

Options

A. Haematoxylin
B. Eosin
C. Ethidium bromide
D. Methylene blue

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the name of a stain that identifies DNA as orange strands when viewed under UV light.

2. **Analyzing the Options**:
- **Option 1: Hematocyanin** - This stain is known to produce a deep blue-purple color and is used in histology for examining tissues. Therefore, it is not the correct answer.
- **Option 2: Eosin** - Eosin is a dye that stains cytoplasm and gives a bright pink color. This option is also incorrect as it does not produce an orange color.
- **Option 3: Ethidium Bromide** - Ethidium bromide is a well-known intercalating agent used to stain DNA. When exposed to UV light, it emits an orange color, making it the correct choice.
- **Option 4: Methylene Blue** - Methylene blue is used for various purposes, including identifying infections, and it produces a blue color, which is not the answer we are looking for.

3. **Conclusion**: After analyzing all the options, the appropriate stain that identifies DNA as orange strands under UV light is **Ethidium Bromide**.

**Final Answer**: Ethidium Bromide

---