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': 'Tight junctions are seen in all except \nSelect and explain. \nA. Cardiac muscle, B. Renal tubules, C. Intestine, D. Choroid plexus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Tight junctions are seen along the apical margins of cells in epithelium such as the intestinal mucosa, the walls of the renal tubules, and the choroidal plexus.(Ref: Textbook of physiology AK Jain 4th edition page no.9)', 'role': 'assistant'}]