This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Dislocation of Hip, Subject name: Orthopaedics
[{'content': 'Posterior dislocation of hip is characterized by - \nSelect and explain. \nA. Marked shortening of limb, B. Lengthening of limb, C. No change in limb length, D. Extension deformity', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Marked shortening of limb o There is typical deformity' offlexion, adduction, and internal rotation with marked shortening of limb.Hip conditionDeformitySynovitisFlexion, abduction, external rotation, apparent lengtheningArthritisFlexion, adduction, internal rotation, true shorteningPosterior dislocationFlexion, adduction, internal rotation, apparent & true shorteningAnterior dislocationFlexion, abduction, external rotation, true lengtheningFemoral neck fractureExternal rotation, later adduction & flexionIntertrochantric fractureMarked external rotation, later adduction & flexion", 'role': 'assistant'}]