Task: Information Extraction
Input (English): Sentence1: Joan's son ran in the house saying a squirrel had bitten him. Sentence2: Worried, Joan called the doctor. Sentence3: The doctor said she should catch the squirrel, which could be rabid. Sentence4: Joan chased the squirrel around the yard and up a tree. Sentence5: When she fell, she ended up at the doctor without the squirrel.
Output (English): Joan, Joan's son, Squirrel, Doctor