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
[{'content': 'On an average, the distance between femoral ring and saphenous opening (length of femoral canal) is - \nSelect and explain. \nA. 1.25 cm, B. 2.50 cm, C. 3.75 cm, D. 5.00 cm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]