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
True about Macula Densa is/are: 
Select and explain. 
A. Also known as Tubulo glomerular feedback., B. Macula densa senses change in NaCl concentration., C. For autoregulation of GFR., D. All of the above.
D: All of the above.
Answer: D: All of the above. 
Explanation: Function of Macula Densa (Tubulo glomerular feedback): 

Macula densa senses change in NaCl concentration. 
For autoregulation of GFR.