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Furthermore , within CGS , there are several plausible ways to define electromagnetic quantities , leading to different " sub-systems " , including Gaussian units , " ESU " , " EMU " , and Lorentz–Heaviside units .
 person: Gaussian; person: Lorentz–Heaviside
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: Gaussian, Lorentz–Heaviside 
Answer:
 person: Gaussian; person: Lorentz–Heaviside