20311
A series of PACA - hydrogel hybrid systems with increasing PACA side chain hydrophobicity was prepared using physically crosslinked alginate films and hydrophilic diclofenac sodium as model hydrogel / drug system .
 Chemical: PACA; Chemical: PACA; Chemical: diclofenac sodium
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: PACA, PACA, diclofenac sodium 
Answer:
 Chemical: PACA; Chemical: PACA; Chemical: diclofenac sodium