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: Medicine
[{'content': 'During the Ventricular Systole, atrioventricular valves open, semilunar valves close. The statement is \nSelect and explain. \nA. TRUE, B. FALSE, C. Partially true, D. Partially false', 'role': 'user'}, {'content': 'Answer: B \nExplanation: During ventricular systole, contraction of the ventricles causes pressure in the ventricle to increase. \nAlmost immediately the AV valves close (the first heart sound). The pressure in the ventricle continues to increase. \nContinued ventricular contraction causes the pressure in the ventricle to exceed in the pulmonary trunk and aorta. As a result, the semilunar are forced open and blood is ejected into the pulmonary trunk and aorta.', 'role': 'assistant'}]