Q: In this task, you will be presented with a context from an academic paper and a question separated with a 
. You have to answer the question based on the context.
The E2E NLG challenge dataset BIBREF21 is utilized in our experiments, which is a crowd-sourced dataset of 50k instances in the restaurant domain. Our models are trained on the official training set and verified on the official testing set.  
 Question: What datasets did they use?
A:
The E2E NLG challenge dataset BIBREF21