This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Valvular hea diseases, Subject name: Medicine
[{'content': 'Straight back syndrome is associated with? \nSelect and explain. \nA. Mitral valve Prolapse, B. Ankylosing spondylitis, C. Osteopetrosis, D. Cor-triatriatum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Straight back syndrome: Loss of thoracic kyphosis (antero-posterior diameter of chest is relatively lesser), so place available for hea is also less. Hea is sandwiched b/w thoracic veebrae, sternum and rib cage. Causes Mitral valve Prolapse =>Mid Systolic click Ankylosing spondylitis - AR condition', 'role': 'assistant'}]