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: Surgery
Which is false of Horse shoe Kidney -a) Spider like appearance in IVPb) Ureteral Obstruction is commonc) Lower calyx is reversedd) Heminephrectomy improves function 
Select and explain. 
A. b, B. c, C. ac, D. ad
D: ad
Answer: D: ad 
Explanation: None