7446
Together , Sotheby ' s and Christie ' s control more than 90 percent of the fine art and antiques market .
 Sotheby ' s, Christie ' s
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 Sotheby ' s, Christie ' s