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: Unknown
[{'content': 'Which of the following part of corpus callosum develops first - \nSelect and explain. \nA. Dorsal part of genu, B. Ventral part of genu, C. Rostrum, D. Splenium', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Dorsal part of genu o During development of corpus callosum, the dorsal part of genu and the body/trunk form first.o Subsequently, ventral (anterior) part of genu and then the splenium ariseo Last, the rostrum develops.o As a rule of thumb, the corpus callosum is formed from anterior to posterior, with the exception of anterior part of genu and rostrum.", 'role': 'assistant'}]