This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Parathyroid Gland, Subject name: Medicine
Chvostek's sign is elicited by: 
Select and explain. 
A. Facial nerve stimulation by tapping over the parotid, B. BP cuff in arm for 5 minutes, C. Tapping over extensor policies brevis, D. Tapping over flexor retinaculum
A: Facial nerve stimulation by tapping over the parotid
Answer: A: Facial nerve stimulation by tapping over the parotid 
Explanation: Chvostek sign This can be elicited by tapping over the facial nerve when it is entering into the parotid gland. This will cause twitching of facial musculature. The sign is referred to as Chvostek sign. It is seen in patients with hypocalcemia due to irritability of nerves But it can be seen in ~10% of normal individuals also