Who played in last year's fa cup final?
No context provided
Who played in 2017 fa cup final?
Chelsea Arsenal
No context provided
Who played in 2016 fa cup final?
Crystal Palace Manchester United
No context provided
Who played in 2015 fa cup final?
Aston Villa Arsenal
List of FA Cup Finals
https://en.wikipedia.org/wiki/List%20of%20FA%20Cup%20Finals
The Football Association Challenge Cup, commonly known as the FA Cup, is a knockout competition in English football, organised by and named after The Football Association (the FA).
List of FA Cup Finals
The 2015 FA Cup Final was an association football match played between Arsenal and Aston Villa at Wembley Stadium, London, on 30 May 2015.
2015 FA Cup Final
Three minutes into stoppage time, Olivier Giroud scored from close range to give Arsenal a 4–0 victory. 
2015 FA Cup Final
The 2016 FA Cup Final was an association football match between Crystal Palace and Manchester United on 21 May 2016 at Wembley Stadium in London, England, organised by the Football Association (FA).
2016 FA Cup Final
Jesse Lingard, who had been brought on to replace Mata close to the end of regular time, then shot from distance, sending the ball into the top corner of the Crystal Palace goal to give Manchester United a 2–1 victory, and their twelfth FA Cup.
2016 FA Cup Final
The 2017 FA Cup Final was an association football match between London rivals Arsenal and Chelsea on 27 May 2017 at Wembley Stadium in London, England. 
2017 FA Cup Final
After four minutes of stoppage time, the whistle was blown and Arsenal won the FA Cup final 2–1, to secure a record 13th title, while Arsène Wenger became the most successful manager in the tournament's history with seven wins.
2017 FA Cup Final
The Football Association Challenge Cup, commonly known as the FA Cup, is a knockout competition in English football. The 2015 fa cup final was played between Arsenal and Aston Villa  (4–0 victory for Arsenal). In the 2016 FA Cup Final, Manchester United obtained a 2–1 victory (and their twelfth FA Cup) playing against Crystal Palace. The 2017 FA Cup final was between London rivals Arsenal and Chelsea; with Arsenal winning 2–1 (a record 13th title).