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
Straight back syndrome is associated with? 
Select and explain. 
A. Mitral valve Prolapse, B. Ankylosing spondylitis, C. Osteopetrosis, D. Cor-triatriatum
A: Mitral valve Prolapse
Answer: A: Mitral valve Prolapse 
Explanation: 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