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
The conus aeriosus is derived from which of the following? 
Select and explain. 
A. Truncus aeriosus, B. Bulbus cordis, C. Primitive ventricle, D. Primitive atrium
B: Bulbus cordis
Answer: B: Bulbus cordis 
Explanation: B. The smooth pa of the right ventricle, known as the conus aeriosus, is derived from the bulbus cordis