21141
The major ingredient of ginger , [ 6 ] - gingerol , could inhibit angiotensin II type 1 receptor activation , which partially clarified the mechanism of ginger regulating blood pressure and strengthening heart in the cardiovascular system .
 Chemical: [ 6 ] - gingerol
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: [ 6 ] - gingerol 
Answer:
 Chemical: [ 6 ] - gingerol