30605
At constant temperature and pressure , one must consider the Gibbs free energy , " G " , while at constant temperature and volume , one must consider the Helmholtz free energy , " A " , for the reaction ; and at constant internal energy and volume , one must consider the entropy , " S " , for the reaction .
 person: Gibbs; person: Helmholtz
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: Gibbs, Helmholtz 
Answer:
 person: Gibbs; person: Helmholtz