This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'JG cells (juxta glomerular apparatus) are \nSelect and explain. \nA. Macula densa, B. Smooth muscullar cells of afferent aeriole, C. Smooth muscullar cells of efferent aeriole, D. Islets of epithelial cells', 'role': 'user'}, {'content': 'Answer: B \nExplanation: INDERBIR SINGH&;S TEXTBOOK OF HUMAN HISTOLOGY-PAGE NO:313Juxtaglomerular cells the muscle cells in the wall of the afferent aerioles are modified.they are large and rounded(epithelium)and have spherical nuclei. their cytoplasm contains granules that can be stained with special methods. these are called juxtaglomerular cells', 'role': 'assistant'}]