This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Renal carcinoma, Subject name: Pathology
Which of the following is least commonly associated with renal cell carcinoma? 
Select and explain. 
A. Polycythemia, B. Amyloidosis, C. Cushing's syndrome, D. Hypeension
C: Cushing's syndrome
Answer: C: Cushing's syndrome 
Explanation: Risk factors for Renal Cell Carcinoma : Smoking Hypeension Obesity Occupational exposure to Cadmium Chronic dialysis patient having acquired polycystic disease Patient with polycythemia Amyloidosis Cushing syndrome is the one having the least incidence in renal cell cancer out of the given options.