Which of the following is parasite on mustard?

Options

A. Albugo
B. Puccinia
C. Yeast
D. Ustilago

Answer

To determine which of the following is a parasite on mustard, let's analyze the options provided:

1. **Elbu Gu** - This is known as White Rust of Mustard. It is a fungal disease caused by the pathogen Albugo candida, which specifically infects mustard plants and is classified as a parasite.

2. **Oxenia** - This term seems to refer to a similar fungal infection, but it is not specifically recognized as a parasite on mustard. It is more commonly associated with other plants.

3. **Reist** - This option does not correspond to a known parasite on mustard. It may refer to a different organism or disease that does not affect mustard plants.

4. **Astilego** - This is associated with Cundra disease, which primarily affects Bajra (pearl millet) and is not a parasite on mustard.

Based on this analysis, the correct answer is **Elbu Gu**, which is the parasite on mustard.

### Step-by-Step Solution:
1. Identify the options provided: Elbu Gu, Oxenia, Reist, Astilego.
2. Research each option to determine if it is a known parasite on mustard.
3. Confirm that Elbu Gu is known as White Rust of Mustard, which is a parasitic fungal infection.
4. Conclude that the correct answer is Elbu Gu.