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Chen 's stopover in Los Angeles was a sensitive subject , for Chen had originally planned an informal meeting with several members of the US Congress .
 person: Chen; geographical social political: Los Angeles; person: Chen; organization: the US Congress
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 person: Chen; geographical social political: Los Angeles; person: Chen; organization: the US Congress