30175
Bio - inspired , Calcium - free Alginate Hydrogels with Tunable Physical and Mechanical Properties and Improved Biocompatibility .
 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