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An 82 - year - old man with treatment - resistant depression and early Alzheimer ' s disease was started on methylphenidate .
 Disease: treatment - resistant depression; Disease: Alzheimer ' s disease; Chemical: methylphenidate
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Disease: treatment - resistant depression; Disease: Alzheimer ' s disease; Chemical: methylphenidate