This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'The primary form of coisol in the plasma is that which is \nSelect and explain. \nA. Bound to albumin, B. Bound to transthyretin, C. Free in solution, D. Bound to coicosteroid-binding globulin (CBG)', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The majority of coisol is bound to a specific carrier protein, coicosteroid binding globulin (CBG), while smaller amounts are bound nonspecifically to albumin. Few, if any, coisol receptors would be expected in the plasma and transthyretin binds primarily thyroxine.', 'role': 'assistant'}]