1237
Because levodopa increases both phasic and tonic dopaminergic neurotransmission , the critical mechanism mediating the enhancement of learning is unresolved .
 Chemical: levodopa
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:
 Chemical: levodopa