This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lower Limb Traumatology, Subject name: Orthopaedics
[{'content': 'Patellar tendon bearing cast is indicated in the following fracture: \nSelect and explain. \nA. Patella, B. Tibia, C. Medial malleolus, D. Femur', 'role': 'user'}, {'content': 'Answer: B \nExplanation: PTB (patellar tendon bearing) plaster, is a carefully moulded patellar bearing below knee plaster which is used in fractures of shaft of tibia In fracture patella cylindrical cast is used', 'role': 'assistant'}]