6120
A randomized , multicenter study comparing the efficacy and tolerability of tropisetron , a new 5 - HT3 receptor antagonist , with a metoclopramide - containing antiemetic cocktail in the prevention of cisplatin - induced emesis .
 5 - HT3 receptor
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 5 - HT3 receptor