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On January 17 , 2017 , a January 26 , 2018 , release date was set and Rob Letterman confirmed that he is to return as director for the sequel .
 person: Rob Letterman
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Rob Letterman 
Answer:
 person: Rob Letterman