challenge: What was the term used to refer to foreign silver coins in China during the Qing dynasty?
  
  A. Zhongqian (中錢, 'central money')
  B. Minqian (民錢, 'people's money')
  C. Huangqian (皇錢, 'imperial money')
  D. Yangqian (洋錢, 'ocean money')
  Answer: 