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
Five-day self subsiding pain is diagnostic of ? 
Select and explain. 
A. Anal fissure, B. Fi stul -in -ano, C. Thrombosed external hemorrhoids, D. Thrombosed internal hemorrhoids
C: Thrombosed external hemorrhoids
Answer: C: Thrombosed external hemorrhoids 
Explanation: Ans. is 'c' i.e., Thrombosed external hemorrhoids