2637
Vitamin D is a fat - soluble precursor of the circulating 25 - hydroxyvitamin D 3 ( 25 ( OH ) D 3 ) which can be converted by the 1 alpha - hydroxylase ( 1 alpha ( OH ) ase ) enzyme into the bioactive hormonal metabolite 1 , 25 - dihydroxyvitamin D 3 ( 1 , 25 ( OH ) 2 D 3 ) , generally known to promote bone mineralization through its ability to enhance calcium absorption from the gut .
 Chemical: Vitamin D; Chemical: 25 - hydroxyvitamin D 3; Chemical: 25 ( OH ) D 3; Chemical: 1 , 25 - dihydroxyvitamin D 3; Chemical: 1 , 25 ( OH ) 2 D 3; Chemical: calcium
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Vitamin D; Chemical: 25 - hydroxyvitamin D 3; Chemical: 25 ( OH ) D 3; Chemical: 1 , 25 - dihydroxyvitamin D 3; Chemical: 1 , 25 ( OH ) 2 D 3; Chemical: calcium