Building a Q&A model

Hi,
I’m thinking to build a Q&A model and train it with datasets for different topics. Then to be able to use it for queryes and provide best answer from the dataset. More or less like a search engine does.

There do I start?
Is there some NLP pretained model that can help with that?

Ex data set:
Mary go to the bathroom.
An go to the theatre.

Question:
Where is Mary?

ML Answer:
bathroom

See the SQuAD and CoQA leaderboard for inspiration.

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thank you
regards

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