Joe Finds Himself Troubled with Gas After Eating Certain Foods

Joe finds himself troubled with gas after eating certain foods. Which is not true about intestinal gas?

A) It comes directly from the food.
B) Another name for it is "flatus."
C) It is produced from bacterial fermentation.
D) The quantity of the gas depends on the types of foods eaten.
E) The quality of the gas depends on the types of foods eaten.