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Mars Polar Lander " , and " Deep Space 2 " crashed into the polar regions which are now treated as special regions because of the possibility of forming liquid brines .
 vehicle: Mars Polar Lander; instrument: Deep Space 2
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Mars Polar Lander, Deep Space 2 
Answer:
 vehicle: Mars Polar Lander; instrument: Deep Space 2