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
Adrenaline is secreted by ? 
Select and explain. 
A. Anterior pituitary, B. Posterior pituitary, C. Adrenal coex, D. Adrenal medulla
D: Adrenal medulla
Answer: D: Adrenal medulla 
Explanation: Ans. is 'd' i.e., Adrenal medulla