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The Sigma 's APO 70-200mm F2 .8 EX DG OS HSM was announced in 2010 , is an EX Lens meaning its in Sigma 's high-end line up of lenses , Build quality is high and feels very solid , A 4 f-stops OS ( Optical Stabilizer ) to help stop any blurring in hand held shooting and features a HSM AF motor for fast and silent auto-focus a constant maximum aperture of f/2 .8 throughout the zoom range .
 organization: Sigma; organization: Sigma
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: Sigma, Sigma 
Answer:
 organization: Sigma; organization: Sigma