This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Physiology
[{'content': 'Not a stimulus for normal/resting ventilation \nSelect and explain. \nA. Stretch receptors, B. J receptors, C. PO2, D. PCO2', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Juxtacapillary receptors, J-receptors, or pulmonary C-fiber receptors are sensory nerve endings located within the alveolar walls in juxtaposition to the pulmonary capillaries of the lung, and are innervated by fibers of the vagus nerve Ref: guyton and hall textbook of medical physiology 12 edition page number: 365,366,367', 'role': 'assistant'}]