55066
Moreover , the fact that the polarization can only depend on the electric field at previous times ( i.e. effectively 0 for ) , a consequence of causality , imposes Kramers–Kronig constraints on the susceptibility .
 person: Kramers–Kronig
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: Kramers–Kronig 
Answer:
 person: Kramers–Kronig