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
All the following hormones are secreted by adrenal cortex except: 
Select and explain. 
A. Estriol, B. Cortisol, C. Corticosterone, D. Aldosterone
A: Estriol
Answer: A: Estriol 
Explanation: None