Public preview: Azure Cognitive Services Text Analytics adds question answering feature

The new, standard question answering feature will try to find the relevant answer for a user question, from a given passage of text such as a document returned as a search result, standalone web page etc. * Input: passage/document text and question text. * Output: answer from the passage/doc text This functionality is provided as an API and can be used without having to learn the details about QnA Maker. We currently support the ability to pass text from up to five documents. [Read the blog](https://aka.ms/QuestionAnsweringAtBuild21). [Watch the Build session on Azure AI](https://aka.ms/2021BuildIntelApps). * Azure Cognitive Services * Features * [ Azure Cognitive Services](https://azure.microsoft.com/en-gb/products/cognitive-services/)