251877
At his debut in Hamburg in 1888 , he played Tchaikovsky 's Piano Concerto No. 1 in B flat minor with the composer conducting .
 location: Hamburg; person: Tchaikovsky
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: Hamburg, Tchaikovsky 
Answer:
 location: Hamburg; person: Tchaikovsky