Teacher: You are given a target person and two sentences. Your task is to determine whether the second sentence conveys either a stereotype, anti-stereotype, or is unrelated with respect to the first sentence and the target.  A stereotype is a widely held but oversimplified notion of a group of people. An anti-stereotype is an idea that goes against the widely held but oversimplified notion of a group of people. Sentences and targets are unrelated if there is no relevance between them.
Teacher: Now, understand the problem? If you are still confused, see the following example:
Target: mother 
The mother walked into her kitchen. She pulled a beer out of the fridge and leaned against the doorway, sipping it slowly.
Solution: anti-stereotype
Reason: This is an anti-stereotype because as a stereotype, mothers do not drink alcohol and do not have a casual, care-free stance when they do so.

Now, solve this instance: Target: schoolgirl 
I saw a schoolgirl in the grocery store. Birds like to nest in the spring.
Student:
unrelated