This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Serum does not contain \nSelect and explain. \nA. Fibrinogen, B. Cerruloplasmin, C. Albumin, D. Globulin', 'role': 'user'}, {'content': "Answer: A \nExplanation: Serum has essentially the same composition as plasma, except that its fibrinogen and clotting factors II, V, and VIII (Table 32-5). (Ref: Ganong's review of medical physiology 23rd Edition page no.530)", 'role': 'assistant'}]