This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc. (W.B.C), Subject name: Pathology
[{'content': 'A 2 year old child presents with scattered lytic lesions in the skull. Biopsy revealed Langerhans giant cells. The most commonly associated marker with this condition will be - \nSelect and explain. \nA. CD 1a, B. CD57, C. CD3, D. CD68', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) CD 1a(Ref: Robbins 9th/pg 621-622)Clinical features are s/o LCH. The most commonly associated marker with this condition will be CD 1a', 'role': 'assistant'}]