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A large proportion of professional racing drivers began in karts , often from a very young age , such as Michael Schumacher and Fernando Alonso .
 Michael Schumacher, Fernando Alonso
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Michael Schumacher, Fernando Alonso