This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Anatomy
[{'content': 'One of the following disease will show urinary bladder calcification radiologicaly which resemble fetal head in pelvis- \nSelect and explain. \nA. Tuberculosis, B. Chronic cystitis, C. Malignancy, D. Schistomiasis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Schistosomiasis - is the commonest cause of calcification in the wall of bladder. Thin curvilinear calcification outlines a bladder of normal size and shape. Calcification spreads proximally to involve the distal ureters (appearing as two parallel lines) in 15%." This is maximum. I could lay my hands on. But this paragraph points towards schistosomiasis. - Schistosomiasis causes calcification in the wall of the bladder which outlines the bladder. A full bladder will appear as a fetal head in pelvis.', 'role': 'assistant'}]