I wanted to update the basics of my wardrobe for work so I bought a black dress but not a short skirt because the 
OPTIONS:
- skirt is inappropriate.
- dress is inappropriate.
skirt is inappropriate.

Michael's lab formulates helpful drugs for people like Derrick, so 
OPTIONS:
- Michael is the lab technician.
- Derrick is the lab technician.
Michael is the lab technician.

Sarah had to ask Laura for help with setting MAC keyboard shortcuts because 
OPTIONS:
- Sarah never used MACs.
- Laura never used MACs.
Sarah never used MACs.