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
Insulin secretion is decreased by: 
Select and explain. 
A. Glucagon, B. Glucose, C. Adrenaline, D. Vagal stimulation
C: Adrenaline
Answer: C: Adrenaline 
Explanation: C i.e. Adrenalin