This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
True about Galvanic Skin Response 
Select and explain. 
A. Indicator of thermal sweating, B. | By sweating because of sweat has electrolytes, C. Fall when sympathetic activity is high, D. Fall is associated with yogic practice
A: Indicator of thermal sweating
Answer: A: Indicator of thermal sweating 
Explanation: The Galvanic Skin Response (GSR), also named Electrodermal Activity and Skin Conductance , is the measure of the continuous variations in the electrical characteristics of the skin, i.e. for instance the conductance, caused by the variation of the human body sweat glands. Ref guyton and hall textbook of medical physiology 12/e p73