This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Anatomy
[{'content': 'Cardiac involvement in carcinoid syndrome is characterized by: \nSelect and explain. \nA. Calcification tricuspid valve, B. Intimal fibrosis of right ventricle,tricuspid and pulmonary valve, C. Involvement of the major blood vessels is commonly seen, D. Equal involvement of both the sides of hea', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cardiac lesions are present in 50percent of the patients with the carcinoid syndrome. These are largely right sided due to inactivatiin of both serotonin and bradykinin in the blood during passage through lungs by the monoxime oxidase present in pulmonary vascular endothelium. (ref Robbins 8th/569)', 'role': 'assistant'}]