Step 1: Question Analysis.
The query seeks the name of an AI application released by the Indian government designed to aid regional language study resources.
Step 2: Option Evaluation.
- Option A: "Bhasha Sangam" pertains to linguistic diversity but is not the specific app for regional study materials. - Option B: "Diksha" is an educational platform, but its focus is not exclusively on regional languages. - Option C: "Prabandh" is unrelated to the application described in the query. - Option D: Correct. "Anuvadini" is the AI-based application launched for regional language study materials. - Option E: "Bhasini" is an AI application for translating content into regional languages, not specifically for study materials.
Step 3: Determination.
Anuvadini is the correct response.
Final Answer: \[\boxed{\text{D}}\]