This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolic and endocrine disorders, Subject name: Orthopaedics
[{'content': 'Which of the following site is least commonly involved in ahrogryposis? \nSelect and explain. \nA. Knee, B. Hip, C. Trunk, D. Elbow', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ahrogryposis multiplex congenita (AMC) is a disorder of defective development of the muscles. The muscles are fibrotic and result in foot deformities and deformities at other joints. The areas that are most likely to have lack of movement are the shoulders, elbows, wrists, hands, hips, knees, and feet.Ref: Maheswari 5th edition Pg: 212', 'role': 'assistant'}]