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
Positive feed back is seen in A/E : 
Select and explain. 
A. LH Surge, B. Entry of Ca into sarcoplasmic reticulum, C. Stimulation of gastric secretion of histamine & gastrin, D. Thrombolytic activity in coagulation cascade
C: Stimulation of gastric secretion of histamine & gastrin
Answer: C: Stimulation of gastric secretion of histamine & gastrin 
Explanation: C i.e. Stimulation of gastric secretion by histamine & gastrinMost control system of the body are negative feed back system. Release of acid in stomach by the action of gastrin is negative feed back system, as Tin acid secretion inhibits fuher gastrin secretion.