单选题 The passage provides information in support of which of the following assertions?

• (A) Lymphoid tissue somehow involved in the body's ability to recognize foreign antigens in ingested material is a primary cause of ulcerative colitis.
• (B) The appendix is an anomaly among mammals, existing in rabbits and humans largely as an evolutionary fluke.
• (C) Microscopic research is insufficient to give even the vaguest suggestion of what the human appendix's function may be.
• (D) The digestive process in human beings is less dependent on the hindgut fermentation process than is the digestive process in rabbits.
• (E) Lymphoid tissue that recognize foreign antigens is absent in the digestive systems of animals that lack appendixes.