21071
These studies were a 4 - week open - label , single - center trial to evaluate the efficacy of oral Polycalcium on bone metabolism and safety .
 Chemical: Polycalcium
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: Polycalcium