hair - countable or uncountable?

[Nessie]

1/ Oh! there is ... hair in my bread
a. a
b. no article
2/ Aspirin can ... stomach
a. ulcerate
b. heal
_________________
:(... something we never have again, I know... I guess I really really know.. :(

Sorry seems to be the hardest word...

[Theeny]

1. There is a hair in my bread. Without an article it suggests that there is a lot of hair in the bread, rather than one single hair which is more probable.

2. Aspirin can ulcerate the stomach.

:)