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': 'Which of the following pa of corpus callosum develops first \nSelect and explain. \nA. Dorsal pa of genu, B. Ventral pa of genu, C. Rostrum, D. Splenium', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Dorsal pa of genuDuring development of corpus callosum, the dorsal pa of genu and the body/trunk form first.Subsequently, ventral (anterior) pa of genu and then the splenium arise.Last, the rostrum develops.", 'role': 'assistant'}]