This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid & Electrolyte, Subject name: Medicine
"Chovestek's sign" is seen in: 
Select and explain. 
A. Hypocalcemia, B. Hypercalcemia, C. Hypokalemia, D. Hyperkalemia
A: Hypocalcemia
Answer: A: Hypocalcemia 
Explanation: (Hypocalcemia): Ref: 777-778-CMDT-09Hypocalcemia - Sign & Symptoms* Extensive spasm of skeletal muscle causes cramps and Tetany* Laryngospasm with stridor can obstruct the airway* Convulsions can occur as well as parasthesias of lips and extremities and abdominal pain* Chvostek's sign (contraction of the facial muscle in response to tapping the facial nerve anterior to the ear)* Trousseau's sign: - (carpal spasm occurring after occlusion of the brachial artery with a blood pressure cuff for 3 minutes)* Prolongation of the QT interval (due to lengthened ST segment) predisposes to the development of ventricular arrhythmias