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': 'Serpentine receptor is a: \nSelect and explain. \nA. Three pass transmembrane protein, B. Five pass transmembrane protein, C. Seven pass transmembrane protein, D. Nine pass transmembrane protein', 'role': 'user'}, {'content': "Answer: C \nExplanation: Serpentine Receptors are G protein coupled receptors that span the cell membrane seven times (seven pass transmembrane protein). Ref: Ganong's Review of Medical Physiology, 21st Edition, Page 42", 'role': 'assistant'}]