###Rationale: Function of Macula Densa (Tubulo glomerular feedback): 

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

###Answer: OPTION D IS CORRECT.
###Question: True about Macula Densa is/are:
###Options:
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.
