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: Radiology
Cannon balls seen in the lungs are characteristic of: 
Select and explain. 
A. Seminoma testes, B. Carcinoid, C. Hypernephroma, D. Pheochromocytoma
C: Hypernephroma
Answer: C: Hypernephroma 
Explanation: Pheochromocytoma