73861
The atmospheres of the planets Venus and Mars are primarily composed of carbon dioxide , with small quantities of nitrogen , argon , oxygen and traces of other gases .
 Venus, Mars
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:
 Venus, Mars