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A galvanic cell , or voltaic cell , named after Luigi Galvani , or Alessandro Volta respectively , is an electrochemical cell that derives electrical energy from spontaneous redox reactions taking place within the cell .
 person: Luigi Galvani; person: Alessandro Volta
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: Luigi Galvani, Alessandro Volta 
Answer:
 person: Luigi Galvani; person: Alessandro Volta