| QuestionAnswerer | API to answer questions based on context. |
| BertQuestionAnswerer | Returns the most possible answers on a given question for QA models (BERT, Albert, etc.). |
| BertQuestionAnswerer.BertQuestionAnswererOptions | Options for setting up a BertQuestionAnswerer. |
| BertQuestionAnswerer.BertQuestionAnswererOptions.Builder | Builder for BertQuestionAnswerer.BertQuestionAnswererOptions. |
| QaAnswer | Answers to QuestionAnswerer. |
| QaAnswer.Pos | Position information of the answer relative to context. |