13411
With subject age , there are decreases in basal osteoblast potential and in stimulation of osteoblastogenesis by 1 alpha , 25 ( OH ) ( 2 ) D , 25 ( OH ) D , and PTH .
 Chemical: 1 alpha , 25 ( OH ) ( 2 ) D; Chemical: 25 ( OH ) D
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: 1 alpha , 25 ( OH ) ( 2 ) D; Chemical: 25 ( OH ) D