17945
To illustrate the significance of this claim , they draw a comparison between the early twenty-first century and that of the mid-nineteenth century , famously engaged by Karl Marx , in which factory labor was dominant even if it was not the form of labor practiced by the most people .
 person: Karl Marx
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: Karl Marx 
Answer:
 person: Karl Marx