89714
However , as properties such as brittleness of mild steel improved with better ferrous metallurgy and as steel became less costly to make thanks to the Bessemer process and the Siemens-Martin process , the use of wrought iron declined .
 person: Bessemer; organization: Siemens-Martin
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: Bessemer, Siemens-Martin 
Answer:
 person: Bessemer; organization: Siemens-Martin