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The novel also contains references to Herbert Spencer in chapters 8 , 10 , Charles Darwin in chapters 5 , 6 , 10 , 13 , Omar Khayyam in chapters 11 , 17 , 26 , Shakespeare in chapter 5 , and John Milton in chapter 26 .
 person: Herbert Spencer; person: Charles Darwin; person: Omar Khayyam; person: Shakespeare; person: John Milton
Please list all entity words in the text that fit the category.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} 
Answer:
 person: Herbert Spencer; person: Charles Darwin; person: Omar Khayyam; person: Shakespeare; person: John Milton