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
Plummer- Vinson syndrome 
Select and explain. 
A. Is due to folic acid deficiency, B. Common in males, C. Not associated with oral premalignancy, D. Strong association with post-cricoid carcinoma
D: Strong association with post-cricoid carcinoma
Answer: D: Strong association with post-cricoid carcinoma 
Explanation: None