This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
[{'content': 'Stones in the distal portion of Wharton’s duct are best visualized by: \nSelect and explain. \nA. Standard mandibular occlusal view, B. Lateral oblique view of the mandible, C. Panoramic film, D. IOPA radiograph', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Typically, the occlusal radiograph is useful in the following cases:\n\nTo\xa0locate\xa0precisely\xa0roots\xa0and\xa0supernumerary,\xa0unerupted,\xa0and impacted teeth (this technique is especially useful for impacted canines and third molars).\nTo localize foreign bodies in the jaws and stones in the ducts of sublingual and submandibular glands.\nTo demonstrate\xa0and\xa0evaluate\xa0the\xa0integrity\xa0of\xa0the\xa0anterior, medial, and lateral outlines of the maxillary sinus.\nTo\xa0aid\xa0in\xa0the examination of\xa0patients with trismus, who can open their mouths only a few millimeters; this condition precludes\xa0intraoral\xa0radiography,\xa0which\xa0may\xa0be\xa0impossible\xa0or\xa0at least extremely painful for the patient.\nTo obtain information about the location, nature, extent, and displacement of fractures of the mandible and maxilla.\nTo determine the medial and lateral extent of disease (e.g., cysts, osteomyelitis, malignancies) and to detect disease in the palate or floor of the mouth.\n\nOral radiology White and Pharaoh; 7th ed. Page no 126', 'role': 'assistant'}]