Step 1: Understanding Robusta.
Robusta is a variety of coffee plant scientifically known as \textit{Coffea canephora}. It is widely cultivated for coffee beans used in instant coffee and espresso blends.
Step 2: Analyzing the options.
Robusta is not related to rice, sugarcane, or tea. It is specifically associated with coffee, one of the two main commercial species (the other being Arabica).
Step 3: Conclusion.
Therefore, Robusta is associated with coffee.