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: Surgery
Plasma of hyperthyroid patient contains excess of: 
Select and explain. 
A. T3., B. Free thyroxine., C. Protein bound thyroxine., D. RT3.
B: Free thyroxine.
Answer: B: Free thyroxine. 
Explanation: None