322534
Jeffrey S. Medkeff ( 1968 – 3 August 2008 ) , usually known as Jeff Medkeff , was a prominent science writer and educator .
 person: Jeffrey S. Medkeff; person: Medkeff
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: Jeffrey S. Medkeff, Medkeff 
Answer:
 person: Jeffrey S. Medkeff; person: Medkeff