Cuscuta is

Options

A. twinner
B. trailer
C. lianas
D. tendril climber

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about Cuscuta and its classification among the given options: twinner, trailer, liana, and tendril climber.

2. **Defining Twinner**: A twinner is a type of climbing plant that wraps itself around a support. These plants are touch-sensitive and can curl around objects to grow upward.

3. **Defining Trailer**: Trailers are rooted plants that spread along the ground. Unlike twinners, trailers have roots that anchor them to the soil while they extend horizontally.

4. **Defining Liana**: Lianas are long-stemmed woody vines that are rooted at the ground level and climb up trees or other structures to reach sunlight. They are typically found in dense forests.

5. **Defining Tendril Climber**: Tendril climbers have weak stems and use tendrils (small, coiling structures) to attach themselves to supports. They are also touch-sensitive and help stabilize the plant as it grows.

6. **Identifying Cuscuta**: Cuscuta, commonly known as dodder, is a parasitic plant that wraps around its host plants. It does not have chlorophyll and relies on its host for nutrients. Given its climbing nature and ability to wrap around other plants, Cuscuta fits the definition of a twinner.

7. **Conclusion**: Based on the definitions and characteristics of the options provided, Cuscuta is best classified as a **twinner**. Therefore, the correct answer is **option A**.