This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdominal Radiography, Subject name: Radiology
[{'content': 'Thickness of stomach wall in ultrasound is considered within normal limits:(JIPMER 95) \nSelect and explain. \nA. 2 mm, B. 5 mm, C. 8 mm, D. 10 mm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The normal stomach wall measures 3 to 5 mm; however, wall thickness up to 7 mm is considered within normal limits because adequate distension is difficult to achieve on conventional sonography. Thickening can be due to neoplastic or inflammatory causes, and thickening of greater than 1 cm is generally considered to be due to malignancy.', 'role': 'assistant'}]