This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection of Bones & Joints, Subject name: Orthopaedics
[{'content': 'Which of the following best describes felon? \nSelect and explain. \nA. Cystic swelling at the back of the wrist, B. Infection of nail fold, C. Infection of pulp space, D. Thickened fibrous sheath at the wrist', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Infection of pulp space * Felon is the infection of distal pulp space. Next to acute paranychia, this is the most common hand infection. It usually follows a pinprick, with index finger and thumb being the common unfortunate victim. The patient initially complains of dull pain and swelling. Pain may be excruciating if the pressure of this tight compartment increases significantly because pus is entrapped in fingertip septae.* Complications are osteomyelitis (most common), skin necrosis, osteonecrosis of digits and rarely tenosynovitis or infective arthritis of DIP joint.* Treatment consists of antibiotics in the initial stages and if the pain lasts for more than 12 hours, incision and drainage helps. If osteomyelitis develops, sequestrectomy of distal phalanx is done.", 'role': 'assistant'}]