Name the interaction that exists between Cuscuta and shoe-flower plant.

Explanation

### Step-by-Step Solution:

1. **Identify the Organisms**: The two organisms in question are Cuscuta and the shoe-flower plant (Hibiscus).

2. **Understand the Nature of Interaction**: Recognize that interactions in ecosystems can be mutualistic, commensalistic, or parasitic.

3. **Define Parasitism**: Parasitism is an interaction where one organism (the parasite) benefits at the expense of another organism (the host).

...