This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'Colloidal osmotic pressure in plasma is exerted mainly by? \nSelect and explain. \nA. Albumin, B. Globulin, C. Fibrinogen, D. Transferrin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Albumin is single most important plasma protein help in maintaining osmotic pressure in plasma.', 'role': 'assistant'}]