12397
This study evaluated the effects of several 5 - HT2A antagonists ( eplivanserin , volinanserin and AVE8488 ) alone and / or in combination with the short - acting hypnotic , zolpidem , on the rat sleep profile .
 Chemical: eplivanserin; Chemical: volinanserin; Chemical: AVE8488; Chemical: zolpidem
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: eplivanserin, volinanserin, AVE8488, zolpidem 
Answer:
 Chemical: eplivanserin; Chemical: volinanserin; Chemical: AVE8488; Chemical: zolpidem