19797
The endogenous steroid lithocholic acid ( LCA ) dilates cerebral arteries via BK channel activation , which requires recognition by a BK beta 1 site that includes Thr169 .
 Chemical: steroid; Chemical: lithocholic acid; Chemical: LCA; Chemical: Thr169
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: steroid, lithocholic acid, LCA, Thr169 
Answer:
 Chemical: steroid; Chemical: lithocholic acid; Chemical: LCA; Chemical: Thr169