如何将列表转换为数据框？

Question

> A
$jake
[1] "apple" [2] "banana"

$peter
[1] "carrot" [2] "egg" [3] "melon"

如何将A转换为如下所示的数据框？

> A
  name    word
1 jake   "apple"
2 jake   "banana"
3 peter  "carrot" 
4 peter  "egg" 
5 peter  "melon"