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
A 55-year-old male presented with painless terminal hematuria. Cystoscopic examination revealed a solitary papillary tumor. Histopathological examination of the completely resected tumor is suggestive of grade III transitional cell carcinoma with no muscle invasion. further management of this patient is best done by 
Select and explain. 
A. Just follow up, B. Intravesical chemotherapy, C. Intravesical BCG, D. Cystectomy
C: Intravesical BCG
Answer: C: Intravesical BCG 
Explanation: None