22719
These systems are chosen to investigate the effect of the surface curvature on protein adsorption at the same surface chemistry , given by sp ( 2 ) carbon atoms in all cases .
 Chemical: carbon
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: carbon 
Answer:
 Chemical: carbon