Which one of the following is an invasive plant which came to India as a contaminant and is a major caus of pollen allergy in the country?

Options

A. Hibiscus sinensis
B. Parthenium
C. Eicchornia crassipes
D. Triticum aestivum

Explanation

To solve the question regarding which invasive plant came to India as a contaminant and is a major cause of pollen allergy, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are:
- A) Hibiscus
- B) Parthenium
- C) Eichhornia crassipes
- D) Triticum stivum

2. **Understand the Concept of Invasive Plants**: Invasive plants are species that are not native to a specific location and can cause harm to the environment, economy, or human health.

3. **Research Each Option**:
- **Hibiscus**: This is a flowering plant and is not known for being invasive or causing pollen allergies.
- **Parthenium (Carrot Grass)**: This plant is known to be invasive and is a significant cause of pollen allergies in India.
- **Eichhornia crassipes (Water Hyacinth)**: While this plant is invasive, it is primarily known for its impact on water bodies rather than causing pollen allergies.
- **Triticum stivum (Wheat)**: This is a staple food crop and not an invasive plant.

4. **Narrow Down the Choices**: Based on the research, Parthenium stands out as it is recognized for its invasive nature and its role in causing pollen allergies.

5. **Confirm the Details**: Parthenium was introduced to India in the 1950s as a contaminant with imported wheat and is known to cause respiratory issues such as asthma and bronchitis due to its pollen.

6. **Final Answer**: The correct answer is **B) Parthenium**.