question - usmledreamz

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A 3-month-old baby has severe skin involvement by a process that produces papules and nodules resembling the infant form of seborrheic keratoses. Biopsy of one of the lesions demonstrates infiltration by malignant mononuclear cells with infolded nuclei. Electron microscopy of the lesion demonstrates tennis racket-shaped cytoplasmic structures in the malignant cells. The malignant cells would also likely stain for which of the following?

A. CD1a
B. Desmoglein 3
C. IgA
D. IgG
E. IgM