This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
Which of the following statements about cutaneous shunt~vessels is true? 
Select and explain. 
A. Perform nutritive function, B. Have role in thermoregulation, C. Not under the control of autonomic nervous system, D. These vessels are evenly distributed throughout the skin
B: Have role in thermoregulation
Answer: B: Have role in thermoregulation 
Explanation: These are low resistance connection between the aerioles and veins bypassing the capillariesAbundantly innervated by sympathetic nerve fibresEspecially found in skin of fingers, toes and earlobes where they are involved in the thermoregulationRef: Medical Physiology Indu Khurana 2015 edition page No: 237