41135
The resulting hard substance , called ' clinker ' , is then ground with a small amount of gypsum into a powder to make " ordinary Portland cement " , the most commonly used type of cement ( often referred to as OPC ) .
 location: Portland
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: Portland 
Answer:
 location: Portland