Ada is a traditional rice dough sweet, filled and steamed in banana leaves, characteristic of Kerala.
- Modak, a Maharashtrian sweet, resembles Ada but is typically made with rice flour and filled with coconut and jaggery.
- Puran Poli, a Maharashtrian flatbread, contains a sweet lentil filling and is not prepared with rice dough.
- Basundi, a Gujarati milk-based dessert, does not involve rice dough or banana leaves.
Therefore, Ada is the correct answer.