This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Higher Functions, Subject name: Physiology
[{'content': 'The diagram shows the effects of changing the set point of the hypothalamic temperature controller. Which set of changes occurs at point W compared with point V? \nSelect and explain. \nA. Shivering and vasoconstriction, B. Shivering and vasodilation, C. Sweating and vasodilation, D. Sweating and vasoconstriction', 'role': 'user'}, {'content': 'Answer: A \nExplanation: When the set point of the hypothalamic temperature-control centre is suddenly changed from the normal level to higher than normal it produces chilly sensations and shivering. To counteract the cold as perceived by hypothalamus, heat generating and heat preserving mechanism gets activated. One such mechanism of heat preservation is vasoconstriction. It is characteristics of febrile conditions.', 'role': 'assistant'}]