177589
There may have been other unconfirmed tropical cyclones during the season , as meteorologist Christopher Landsea estimated that up to six storms were missed each year from the official database ; this estimate was due to small tropical cyclone size , sparse ship reports , and relatively unpopulated coastlines .
 person: Christopher Landsea
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Christopher Landsea 
Answer:
 person: Christopher Landsea