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
The skeletal muscles become more excitable even to a mild stimulus is known as: 
Select and explain. 
A. Trousseau's sign., B. Chvostek's sign., C. Erb sign., D. None
C: Erb sign.
Answer: C: Erb sign. 
Explanation: None