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Our production relations are no different from the production relations in Marx 's " Das Kapital , " constantly reproducing a proletariat who can only rely on selling its labor to make a living .
 person: Marx; work of art: Das Kapital
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 person: Marx; work of art: Das Kapital