68890
Paleontologists David M. Raup and Jack Sepkoski have proposed that an excess of extinction events occurs roughly every 26 million years ( though many are relatively minor ) .
 person: David M. Raup; person: Jack Sepkoski
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: David M. Raup, Jack Sepkoski 
Answer:
 person: David M. Raup; person: Jack Sepkoski