This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
[{'content': 'All of the following are the components of the white pulp of spleen, except \nSelect and explain. \nA. Periaeriolar lymphoid sheath, B. B cells, C. Antigen presenting cells, D. Vascular sinus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The spleen contains two main types of tissue - white pulp and red pulp. White pulp is lymphatic tissue (material which is pa of the immune system) mainly made up of white blood cells. Red pulp is made up of blood-filled cavities (venous sinuses) and splenic cords. <img src=" /> Ref - BDC 6e vol2 pg297', 'role': 'assistant'}]