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
Tachycardia is caused by hypoxia due to: 
Select and explain. 
A. Reflexly through peripheral chemoreceptors, B. Diffuse vasodilatation, C. Through central chemoreceptor, D. Secondarily after by hyperventilation
B: Diffuse vasodilatation
Answer: B: Diffuse vasodilatation 
Explanation: B i.e. Diffuse vasodilation