7182
Furthermore , systemic ghrelin induces switching of the dominant opioid receptor pathway for highly rewarding food from mu to kappa , resulting in suppression of the mesolimbic dopamine system .
 Chemical: dopamine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: dopamine