Answer the question

Q. A 30 years old female patient presented to the respiratory medicine OPD with conplaints of respiratory distress and a recent onset chest pain. The ct scan revealed a well delineated, cystic mass in the anterior mediastinum. The mass was excised and sent for histopatgologic confirmation, the gross photo of which is presented below. What is true of the mass?
A. The mass arises from ectopic pleuripotent stem cells which failed to migrate properly.
B. The mass arises from the lymphoid follicles in the thymus.
C. This is not a true mixed tumor.
D. Its rupture could lead to horner syndrome.

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