This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment & Nutritional Pathology, Subject name: Pathology
A 45-year-old woman with longstanding Crohn disease and severe fat malabsorption experiences a fracture of the femoral neck after a minor contusion. This woman most likely has a deficiency of which of the following vitamins? 
Select and explain. 
A. Vitamin B1 (thiamine), B. Vitamin C, C. Vitamin D, D. Vitamin K
C: Vitamin D
Answer: C: Vitamin D 
Explanation: Lipid malabsorption interferes with the absorption of vitamin D, thereby leading to a deficiency state. In adults, vitamin D deficiency results in osteomalacia, a disorder characterized by inadequate mineralization of newly formed bone matrix. The consequent weakness of bone is associated with a vulnerability to spontaneous fractures. Vitamin D deficiency in children is termed rickets. Deficiencies in the other choices are not associated with these bone abnormalities.Diagnosis: Osteomalacia, vitamin D deficiency