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A thorough knowledge of the pathophysiological bases of hypoxemia and O ( 2 ) storage and delivery devices is then mandatory to administer O ( 2 ) therapy guaranteeing for optimal correction of hypoxemia and minimizing the risk of hyperoxia .
 Chemical: O ( 2 ); Chemical: O ( 2 )
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: O ( 2 ); Chemical: O ( 2 )