. . I do n't know if you have a main artery in your thumb but I found one . And I got it all bandaid - ed up .
How did the writer find an artery in their thumb ?
Pick the best answer from the following options:
- They injured their hand .
 - None of the above choices .
 - They used a device to detect the vein .
 - They were looking for veins in their thumb .


They injured their hand .