This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'The interventricular septum is formed by which of the following? \nSelect and explain. \nA. Truncus septum, B. Conus septum, C. Septum spurium, D. Endocardial cushion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Inderbir Singh&;s Human embryology; Tenth edition; Pg 239The cavity formed after the conus and proximal bulbus cordis have merged into the primitive ventricle has to be subdivided into right and left halves.Two ridges termed right and left bulbar ridges arise in the wall of the bulboventricular cavity.These ridges grow toward each other and form bulbar septum.', 'role': 'assistant'}]