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: Pathology
A 2 year old child presents with scattered lesions in the skull. Biopsy revealed Langerhans giant cells. The most commonly associated marker with this condition will be 
Select and explain. 
A. CD 1a, B. CD 57, C. CD 3, D. CD 68
A: CD 1a
Answer: A: CD 1a 
Explanation: None