This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urethra & Penis, Subject name: Surgery
A 27-years old man presents with a left testicular tumor with a 10 cm retroperitoneal lymph node mass. The treatment of choice is: 
Select and explain. 
A. Radiotherapy, B. Immunotherapy with interferon and interleukins, C. Left high inguinal orchiectomy plus chemotherapy, D. Chemotherapy alone
C: Left high inguinal orchiectomy plus chemotherapy
Answer: C: Left high inguinal orchiectomy plus chemotherapy 
Explanation: Ans. (c) Left high inguinal orchiectomy plus chemotherapyGerm Cell Tumor Staging andTreatmentExtent of DiseaseSeminomaNon seminoma* Testis only, no vascular/lymphatic invasion (T1)Radiation therapyRPLND or observation* Testis only, Vascular/lymphatic invasion (T2),* Tunica albuginea (T2),* Involvement of spermatic cord (T3)* Scrotum (T4)Radiation therapyRPLNDNodes <2cmRadiation therapyRPLND or chemotherapy often followed by RPLNDNodes 2-5cmRadiation therapyRPLND+/-adjuvant chemotherapy or chemotherapy followed by RPLNDNodes >5cmChemotherapyChemotherapy, often followed by RPLNDDistant metastasesChemotherapyChemotherapy often followed surgery (biopsy or resection)