18642
In addition , the high phosphonate affinity towards bone and other calcified tissues may be utilized for the drug targeting based on synthesis of metal complexes linked to bioactive carrier systems , affording better modalities of attack to the site of pathology .
 Chemical: phosphonate
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: phosphonate 
Answer:
 Chemical: phosphonate