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
Macula densa in kidney is located in relation to ? 
Select and explain. 
A. PCT, B. DCT, C. Afferent aeriole, D. Efferent aeriole
B: DCT
Answer: B: DCT 
Explanation: B i.e. DCT