14203
A consistent effect of repeated exposure to 3 , 4 methylenedioxymethamphetamine ( MDMA ) is a decrease in the tissue levels of serotonin ( 5 - HT ) .
 Chemical: 3 , 4 methylenedioxymethamphetamine; Chemical: MDMA; Chemical: serotonin; Chemical: 5 - HT
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: 3 , 4 methylenedioxymethamphetamine; Chemical: MDMA; Chemical: serotonin; Chemical: 5 - HT