Final answer:
The true stomach of a ruminant animal, where digestion occurs similarly to non-ruminant animals, is called the abomasum.
Step-by-step explanation:
The true stomach of a ruminant animal, which is analogous to the monogastric stomach chamber of non-ruminants, is called the abomasum. In ruminants like goats and cows, the stomach is comprised of four compartments: the rumen, reticulum, omasum, and abomasum. The abomasum is where digestive enzymes are secreted and actual digestion occurs, similar to a single-chambered stomach in non-ruminant animals. Therefore, the correct answer to the question is C) Abomasum.