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': 'Horizontal favourable and unfavourable fractures of mandible is best diagnosed by: \nSelect and explain. \nA. Lateral oblique 30 degrees, B. Lateral oblique 15 degrees, C. Waters view, D. PA view', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Law’s view (15º lateral oblique): Sagittal plane of the skull is parallel to the film and X-ray beam is projected 15 degrees cephalocaudal.\nSchuller’s or Rugnstrom view (30º lateral oblique): Similar to Law’s view, but cephalocaudal beam makes an angle of 30 degrees instead of 15 degrees.', 'role': 'assistant'}]