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The largest refineries for lead and zinc operate in Plovdiv , Kardzhali and Novi Iskar ; for copper in Pirdop and Eliseina ( now defunct ) ; for aluminium in Shumen .
 Plovdiv, Kardzhali, Novi Iskar, Pirdop, Eliseina, Shumen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Plovdiv, Kardzhali, Novi Iskar, Pirdop, Eliseina, Shumen