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In December , he scored a brilliant left-footed drive against West Ham United and soon scored a second , which was later credited as an own goal because the ball rebounded off the post onto goalkeeper Robert Green 's back and bounced in .
 organization: West Ham United; person: Robert Green
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: West Ham United, Robert Green 
Answer:
 organization: West Ham United; person: Robert Green