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: Medicine
Which of the following statements about Histamine is true: September 2012 
Select and explain. 
A. Is found in Mast cells, B. Increases gastric acid secretion, C. Related to arousal and blood pressure, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans: D i.e. All of the above Histamine Histamine is formed by: Decarboxylation of histidine Function of histamine: Mediates triple response