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As the second son of Sir William Flower , Stanley took an early interest in natural history and from the age of eleven regularly attended the meetings of the Zoological Society with his father .
 Sir William Flower, Zoological Society
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sir William Flower, Zoological Society