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
It is true about seminoma testis that - 
Select and explain. 
A. It commonly occurs in the 6th decade, B. An undescended testes is more liable to develop this tumour, C. Histologically it resembles dysgerminoma of the ovary, D. It is radioresistant
A: It commonly occurs in the 6th decade
Answer: A: It commonly occurs in the 6th decade 
Explanation: Ans. is 'a' i.e., CT or and orchidectomy