A 30-year old man has a malabsorption syndrome characterized by abdominal distension, loose stools and steatorrhea. He has bone pain. X-rays of the bone shows deminineralization and fractures. The most likely cause of this bone abnormalities is deficiency of which of the following ?                                                  (A) Calcitonin.                                                                                                                                                     (B) Parathyroid hormone.                                                                                                                                   (C) Vitamin A.                                                                                                                                                     (D) Vitamin C.                                                                                                                                                     (E) Vitamin E

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