4191
The children had a medical history significant for attention deficit disorder previously treated with methylphenidate without success .
 Disease: attention deficit disorder; 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: attention deficit disorder; Chemical: methylphenidate