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: Pathology
A 24 year old male presented with retroperitoneal left necrotic mass near the hilum of kidney which showed heterogenous contrast enhancement on CECT. What is the probable diagnosis? 
Select and explain. 
A. Metastatic transitional cell carcinoma, B. Metastatic melanoma, C. Metastatic germ cell tumour, D. Lymphoma
C: Metastatic germ cell tumour
Answer: C: Metastatic germ cell tumour 
Explanation: . Metastatic germ cell tumour