This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Digestion and Absorption, Subject name: Physiology
[{'content': 'Fecal mass is mainly derived from: \nSelect and explain. \nA. Undigested food, B. Digested food, C. Intestinal secretion, D. Intestinal absorption', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Undigested foodRef: Ganong 25th ed. / 502* Fecal mass is derived from undigested food.* Feces are the particles of waste matter that is left over after the body has processed and absorbed nourishment from the foods we eat.* It contains water, dietary fiber, inorganic salts, dead cells, bacteria, and anything the body cannot or will not absorb.', 'role': 'assistant'}]