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
Muscle hypotension is caused by? 
Select and explain. 
A. Bradykinin, B. Actin, C. Myosin, D. Relaxin
A: Bradykinin
Answer: A: Bradykinin 
Explanation: Ans. is'a'i.e., BradykininOnly bradykinin cause hypotension - Local hypotension in skeletal muscle (If pressure BP to fall below 50 mm Hg).