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Engines may be mounted in individual nacelles , or in the case of larger aircraft such as the Boeing B-52 Stratofortress ( pictured right ) may have two engines mounted in a single nacelle .
 Boeing B-52 Stratofortress
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Boeing B-52 Stratofortress