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In 2019 , a study by Hokkaido University on fossil corals in Oman provides an evidence that prolonged winter shamal seasons led to the salinization of the irrigated fields ; hence , a dramatic decrease in crop production triggered a widespread famine and eventually the collapse of the ancient Akkadian Empire .
 organization: Hokkaido University; location: Oman
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: Hokkaido University, Oman 
Answer:
 organization: Hokkaido University; location: Oman