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The eruption of nearby Mount Nyiragongo in 2002 sent lava flowing into the lake , raising fears that a gas eruption could be triggered , but it was not , as the flow of lava stopped well before it got near the bottom layers of the lake , where the gas is maintained in solution by the water pressure .
 location: Mount Nyiragongo
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: Mount Nyiragongo 
Answer:
 location: Mount Nyiragongo