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During a historical series of four " Clásicos " against rivals Barcelona in April 2011 , Ronaldo scored twice to equal his personal record of 42 goals in all competitions in a single season .
 Barcelona, Ronaldo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Barcelona, Ronaldo