2525
OBJECTIVE : This study was designed to determine whether patients maintained on a regimen of lithium on a once - per - day schedule have lower urine volumes than do patients receiving multiple doses per day .
 Chemical: lithium
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: lithium 
Answer:
 Chemical: lithium