29333
Our previous results showed that methylphenidate treatment in adolescent SHR enhanced cocaine self - administration during adulthood , and alterations in DAT function in prefrontal cortex play a role in this response .
 Chemical: methylphenidate; Chemical: cocaine
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: methylphenidate, cocaine 
Answer:
 Chemical: methylphenidate; Chemical: cocaine