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: Orthopaedics
[{'content': 'Phocomelia is best described as - \nSelect and explain. \nA. Defect in development of long bones, B. Defect in development of flat bones, C. Defect of intramembranous ossification, D. Defect of cartilage replacement by bone', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Phocomelia :- Entire central portion of limb is absent. For example, complete forearm (radius and ulna) is absent and the hand is attached to arm.', 'role': 'assistant'}]