88387
Blood flow ensures the transportation of nutrients , hormones , metabolic waste products , O and CO throughout the body to maintain cell-level metabolism , the regulation of the pH , osmotic pressure and temperature of the whole body , and the protection from microbial and mechanical harm .
 location: CO
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: CO 
Answer:
 location: CO