This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CVS Embryology, Subject name: Anatomy
[{'content': 'The conus aeriosus is derived from which of the following? \nSelect and explain. \nA. Truncus aeriosus, B. Bulbus cordis, C. Primitive ventricle, D. Primitive atrium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B. The smooth pa of the right ventricle, known as the conus aeriosus, is derived from the bulbus cordis', 'role': 'assistant'}]