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Chithra was introduced to Malayalam playback by M. G. Radhakrishnan in 1979 who recorded her voice for films and private albums .
 Chithra, M. G. Radhakrishnan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chithra, M. G. Radhakrishnan