This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Bladder), Subject name: Surgery
[{'content': 'One of the following diseases shows urinary bladder calcification radiologically which resembles fetal head in the pelvis. \nSelect and explain. \nA. Tuberculosis, B. Schistosomiasis, C. Chronic cystitis, D. Malignancy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' ie. Schistosomiasis (Ref. Chapman, 3/e, p 332) " Schistosomiasis - is the commonest cause of calcification in the wall of the 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 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 the pelvis , on an X-ray.', 'role': 'assistant'}]