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
True about hernia - 
Select and explain. 
A. External abdominal hernia is common, B. Direct hernia usually acquired, C. Strangulation is common in femoral hernia, D. All
D: All
Answer: D: All 
Explanation: Ans. is 'a' i.e. Extra-abdominal hernia is common; 'b' i.e. Direct hernia is usually acquired; 'c' i.e. Strangulation is common in femoral hernia "External abdominal hernia is the most common form, the most frequent varieties being the inguinal femoral & umbilical, accounting for 75%" - Bailey & Love 24/e p1272] "Direct hernia is always an acquired type except the Ogilive hernia and occurs in elderly person" - S. Das 3/e p1095