8160
Bio - based fibrous nanocomposites of cellulose nanofibres and non - crosslinked / crosslinked collagen were prepared by in situ pH - induced fibrillation of collagen phase and sterilized using gamma rays at 25 KGy .
 None
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:  
Answer:
 None