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Use of antithymocyte globulin may be the optimal treatment of D - penicillamine - induced aplastic anemia .
 antithymocyte globulin, D - penicillamine, aplastic anemia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 antithymocyte globulin, D - penicillamine, aplastic anemia