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
Superficial inguinal ring is a defect in the: 
Select and explain. 
A. Internal oblique aponeurosis, B. External oblique aponeurosis, C. Transverse abdominis aponeurosis, D. Internal oblique muscle
B: External oblique aponeurosis
Answer: B: External oblique aponeurosis 
Explanation: The inguinal canal is an oblique passage through the lower pa of the anterior abdominal wall.The canal is about 1.5 in. (4 cm) long in the adult and extends from the deep inguinal ring, a hole in the fascia transversalis, downward and medially to the superficial inguinal ring, a hole in the aponeurosis of the external oblique muscle. In the males, it allows structures to pass to and from the testis to the abdomen.In females it allows the round ligament of the uterus to pass from the uterus to the labium majus.