This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
A patient with malabsorption who develops a deficiency of vitamin A is most likely to subsequently develop: 
Select and explain. 
A. Acute leukemia, B. Intestinal metaplasia, C. Megaloblastic anemia, D. Night blindness
D: Night blindness
Answer: D: Night blindness 
Explanation: The symptoms of vitamin A deficiency result from abnormalities involving the normal functions of vitamin A. These normal functions include maintaining mucus-secreting epithelium, restoring levels of the visual pigment rhodopsin, increasing immunity to infections, and acting as an antioxidant.