This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology metabolism, Subject name: Physiology
Major adrenocortical hormone in blood is: 
Select and explain. 
A. Cortisol, B. Corticosterone, C. Aldosterone, D. Deoxy corticosterone
A: Cortisol
Answer: A: Cortisol 
Explanation: Ans: A (Cortisol) Ref: Guyton & Hall, Synthesis and Secretion of Adrenocortical Hormones, In: Textbook of Medical Physiology, 12th ed, Philadelphia, Saunders. Elsevier 2012, p 924Explanation: (See table below)