2231
In an open interventional study , we recruited 25 volunteers ( 16 female , age 60 . 3 +/- 6 . 5 years , body mass index 25 . 7 +/- 2 . 7 kg / m2 ) from the community who were not taking calcium supplements .
 Chemical: calcium
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: calcium 
Answer:
 Chemical: calcium