You will be given a passage consisting of set of facts and a question as input. The task is to answer a question of form 'Where is <person_name>?' using one of the given facts to determine the latest location of the person. Answer should be a word/phrase describing the location from the supporting fact. Avoid answers that are incomplete or incorrect.

Passage: Mary went back to the office. John went back to the bathroom. John went to the hallway. Mary journeyed to the hallway. Sandra travelled to the hallway. Mary travelled to the office. Mary went back to the hallway. Sandra travelled to the office. Question: Where is Sandra?
office