8784
These data suggest that iron carbonyls can be used as scaffolds for the design and synthesis of pharmacologically active CO - RMs and indicate that increasing water solubility and controlling the rate of CO release are important parameters for limiting their potential toxic effects .
 Chemical: iron carbonyls; Chemical: CO; Chemical: CO
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: iron carbonyls, CO, CO 
Answer:
 Chemical: iron carbonyls; Chemical: CO; Chemical: CO