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For example , in the Carnot cycle , while the heat flow from the hot reservoir to the cold reservoir represents an increase in entropy , the work output , if reversibly and perfectly stored in some energy storage mechanism , represents a decrease in entropy that could be used to operate the heat engine in reverse and return to the previous state , thus the " total " entropy change is still zero at all times if the entire process is reversible .
 person: Carnot
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: Carnot 
Answer:
 person: Carnot