Closed fracture of the vault of the skull with intracranial injury and brief loss of consciousness

Which of the following is derived from an animal source?

A) Vincristine B) Thyroid hormone C) Digoxin D) Codeine

Pheochromocytoma is a benign or malignant tumor arising from which of the following?

A. Bile caniculi B. Trophoblastic cells C. Neurochromaffin cells in the adrenal medulla D. Follicular cells of the thyroid