This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
[{'content': 'what is the communication between The cervical canal and cavity of body of uterus ? \nSelect and explain. \nA. internal os, B. external os, C. Right lateral os, D. left lateral os', 'role': 'user'}, {'content': "Answer: A \nExplanation: The cervical canal, i.e. the cavity of the cervix is fusiform in shape. It communicates above with the cavity of the body of the uterus, through the internal os, and below with the vaginal cavity through the external os. Ref : B D Chaurasia's Human Anatomy , Seventh edition , volume 2 , pg. no., 421.", 'role': 'assistant'}]