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
Differential diagnosis of acute funicultitis with a small inguinal swelling is - 
Select and explain. 
A. Undescended testes, B. Acute orchitis, C. Lymphadenitis, D. Small strangulated inguinal hernia
D: Small strangulated inguinal hernia
Answer: D: Small strangulated inguinal hernia 
Explanation: None