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: Unknown
[{'content': "A 2-year old male child has been limping ever since he has started walking. Examination reveals a short right lower limb with limited abduction at the hip. the Trendelenburg sign is positive however telescopy is absent. The most probable diagnosis is- \nSelect and explain. \nA. Kimer's deformity, B. Congential dislocation of the hip, C. Congenital coxa vara, D. Perther's disease", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans-C', 'role': 'assistant'}]