This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: AIIMS 2019, Subject name: ENT
Which of the following is not a cause of Squamous cell Carcinoma for Head & Neck: 
Select and explain. 
A. EBV, B. HPV, C. Betel Nut, D. Vitamin A
D: Vitamin A
Answer: D: Vitamin A 
Explanation: Risk factors for head and neck cancer Tobacco Alcohol Prolonged sun exposure Viruses (HPV) & (EBV) Gender M>F, age > 40yrs Poor oral / dental hygiene; betel nut consumption Environmental or occupational factors Poor nutrition - vitamin A & B deficiency, iron deficiency In question they have mentioned vitamin A NOT vitamin A deficiency