Two-time Olympic champion Lin Dan has retired from badminton. He hails from _______ nation ?

a) China 
b) Japan
c) South Korea
d) Malaysia

Five-time World Champion Lin Dan has announced his retirement from badminton. Dan is considered one of the greatest players in history of the sport. He has won five badminton World Championship titles and six All England champion crowns. He has won a total of 666 singles titles.