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': "In a newborn child, abduction and internal rotation produces a click sound. It is - \nSelect and explain. \nA. Ortolani's sign, B. Telescoping sign, C. Lachman's sign, D. Mc Murray's sign", 'role': 'user'}, {'content': "Answer: A \nExplanation: Barlow's test\nPart 1 → Click sound (clunck) of dislocation on adduction.\nPart 2 → Click sound (clunck) of reduction on abduction.\nOrtolanis test\n\nClick sound (clunk) of reduction on abduction.\n\nNote :\n\nIf both Barlow's test and ortolani's test are given as options in the same question, go ahead with ortolani's test as some clinicians do not consider part 2 as Barlow's test.", 'role': 'assistant'}]