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
Juxtaglomerular apparatus includes 
Select and explain. 
A. Macula densa, B. Juxtaglomerular cells, C. Extraglomerular measngial cells, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: All the above are components of Juxtaglomerular apparatus