86737
The original hydropneumatic system used a vegetable oil ( " liquide hydraulique végétal " , LHV ) , but later switched to a synthetic ( " liquide hydraulique synthétique " , LHS ) .
 vegetable oil
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:
 vegetable oil