There are several apps available that can provide answers to questions and support multiple languages, including Hindi and Bengali. Here are a few examples:

1. Google Assistant: Google Assistant is a virtual assistant app that can answer questions, provide information, and support multiple languages, including Hindi and Bengali. It is available for both Android and iOS devices.

2. Microsoft Cortana: Cortana is another virtual assistant app that can answer questions and support multiple languages, including Hindi and Bengali. It is available for both Android and iOS devices.

3. Quora: Quora is a question-and-answer platform where users can ask questions and receive answers from a community of users. It supports multiple languages, including Hindi and Bengali. The Quora app is available for both Android and iOS devices.

4. Brainly: Brainly is an educational platform where students can ask questions and receive answers from a community of students and educators. It supports multiple languages, including Hindi and Bengali. The Brainly app is available for both Android and iOS devices.

These apps can provide answers to a wide range of questions and support various subjects, including Hindi and Bengali.