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In 1950 , he appeared to great acclaim in Mexico , as Radames in Aida , and as Cavaradossi in Tosca , opposite the young Maria Callas .
 person: Maria Callas
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Maria Callas