This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Cell junction in smooth muscle is \nSelect and explain. \nA. Zonula adherens, B. Macula adherens, C. Tight junction, D. Gap junction', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Adjacent muscles fiber of smooth muscle is connected by gap junctions so that action potential from one cell can quickly pass into the neighbouring cells. (Ref: Textbook of medical physiology-Geetha)', 'role': 'assistant'}]