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: Anatomy
[{'content': 'At the superficial inguinal canal increased abdominal pressure leads to closure by approximation of crura in the opening. This defect is seen in an aponeurosis formed by which of the following muscles? \nSelect and explain. \nA. Fascia tranversalis, B. External oblique, C. Internal oblique, D. Erector spinae', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is'b'i.e., External oblique(Ref: BDC &/e Vol. II p. 212, 213; Ramesh Babu p. 219)Examinar is asking about superficial inguinal ring which is triangular defect in external oblique aponeurosis.Superficial inguinal ring is an anatomical structure in the anterior abdominal wall. It is a triangular shaped defect in the aponeurosis of external oblique muscle", 'role': 'assistant'}]