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
An elderly male presents with one episode of gross haematuria. All of the following investigations are recommended for this patient except: 
Select and explain. 
A. Cystoscopy, B. Urine microscopy for malignant cells, C. Urine tumor markers, D. Intravenous Pyelogram
C: Urine tumor markers
Answer: C: Urine tumor markers 
Explanation: None