7430
Bulk polymers derived from ethylene and propylene are often prepared via Ziegler-Natta catalysis .
 person: Ziegler-Natta
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Ziegler-Natta 
Answer:
 person: Ziegler-Natta