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It was first ascended in 1827 by the naturalist David Douglas , who then wrote that its " height does not seem to be less than 16,000 or 17,000 feet above the level of the sea " .
 person: David Douglas
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: David Douglas 
Answer:
 person: David Douglas