challenge: Who were the defending champions of the mixed doubles tournament in the 2016 Badminton Asia Junior Championships?
  
  A. Pakin Kuna-Anuvit / Kwanchanok Sudjaipraparat of Thailand
  B. Zheng Siwei and Chen Qingchen from China
  C. He Jiting / Du Yue of China
  D. Kim Won-ho and Lee Yu-rim of South Korea
  Answer: 