15171
The resulting hybridomas were screened using protein conjugates which were covalently bound to metal - free EDTA or cadmium .
 Chemical: EDTA; Chemical: cadmium
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: EDTA, cadmium 
Answer:
 Chemical: EDTA; Chemical: cadmium