This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'Tachycardia is caused by hypoxia due to: \nSelect and explain. \nA. Reflexly through peripheral chemoreceptors, B. Diffuse vasodilatation, C. Through central chemoreceptor, D. Secondarily after by hyperventilation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Diffuse vasodilation', 'role': 'assistant'}]