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Witter died in 1902 followed by Johnson nine months later while on a business trip to Wilmington , Delaware to purchase paper machine s. J.D. Witter ’s son-in-law , George W. Mead was the reason why Consolidated became a major force in the paper industry .
 location: Wilmington , Delaware
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: Wilmington , Delaware 
Answer:
 location: Wilmington , Delaware