This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Injuries Around the Thigh & Knee, Subject name: Orthopaedics
[{'content': "Clergyman's knee is? \nSelect and explain. \nA. Pre patellar bursitis, B. Infra patellar bursitis, C. Supra patellar bursitis, D. Pre anserine bursitis", 'role': 'user'}, {'content': "Answer: B \nExplanation: ANSWER: (B) Infra patellar bursitisREF: Keith L Moore 4th ed page 394, Review of Orthopaedics 6th ed by Mark D. Miller, Stephen R. Thompson, Jennifer Hart page 308Indirect repeat Orthopedics 2012 Session 1Infrapatellar bursitis is the inflammation of the infrapatellar bursa, wdiich is located just below the kneecap. It is a common cause of knee pain and swelling among persons whose work involves kneeling on hard surfaces. Depending on the occupation affected it is known by a variety nicknames, most commonly floor layers' knee, but also plumbers' knee, clergyman's knee", 'role': 'assistant'}]