模板循环时提示 template Execute err: template: guess.tpl:101:36: executing "guess.tpl" at <.Option>: range can't iterate over {"A":"无人区","B":"人在囧途","C":"我不是药神","D":"心花路放"}

 template Execute err: template: guess.tpl:101:36: executing "guess.tpl" at <.Option>: range can't iterate over {"A":"无人区","B":"人在囧途","C":"我不是药神","D":"心花路放"}

这是啥原因啊？