Axenic culture is

Options

A. Culture of tissue
B. Culture of genes
C. Pure culture without contamination
D. Pure culture of microbe without any external nutrient.

Answer

### Step-by-Step Solution:

1. **Understanding the Term "Axenic Culture":**
- Axenic culture refers to a culture that is free from any other living organisms except for the one being studied. This means that it is a pure culture.

2. **Analyzing the Options:**
- A. Culture of tissues: This option does not specifically refer to microbial cultures and is not relevant to axenic cultures.
- B. Culture of genes: This option also does not pertain to the concept of axenic cultures, as it focuses on genetic material rather than microbial growth.
- C. Pure culture without combination: This option aligns with the definition of axenic culture, as it emphasizes the purity of the culture without contamination from other species.
- D. Pure culture of microbes without any external nutrient: While this option mentions purity, it incorrectly states that axenic cultures lack external nutrients, which is not necessarily true.

3. **Identifying the Correct Answer:**
- Based on the analysis, option C, "pure culture without combination," is the most accurate definition of axenic culture.

4. **Conclusion:**
- Therefore, the correct answer to the question "Axenic culture is" is option C.