1096
Its Del Mar Racetrack was built by the Thoroughbred Club in 1937 by founding members Bing Crosby and Pat O'Brien with Paramount Studios as corporate sponsor .
 Del Mar, Bing Crosby, Pat O'Brien, Paramount Studios
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Del Mar, Bing Crosby, Pat O'Brien, Paramount Studios