Q: Passage: The 2017 FA Cup Final was the 136th final of the FA Cup, the world's oldest football cup competition. It took place on 27 May 2017 at Wembley Stadium in London, England and was contested between London rivals Arsenal and Chelsea. Arsenal won the game 2 -- 1 to secure a record 13th title, while manager Arsène Wenger became the most successful manager in the tournament's history with seven wins.

Question: Based on this passage, who played in last year's fa cup final?
Let's give stream of consciousness below

The important part for answering this question is: It took place on 27 May 2017 at Wembley Stadium in London, England and was contested between London rivals Arsenal and Chelsea. So the answer is Arsenal and Chelsea.