Teacher:In this task, you are given a sentence and question which can be answered using the sentence. Your task is to answer the question using the information from the sentence. The answer to the question is unique and it is a continuous text span from the sentence.
Teacher: Now, understand the problem? Solve this instance: Sentence: Having finished his apprenticeship with Hammond , Keats registered as a medical student at Guy 's Hospital and began studying there in October 1815 . 
 Question: what did someone begin   doing?
Student:
studying