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(A) Vitamin A
(B) Vitamin B3
(C) Vitamin B1
(D) Vitamin B12
Answer: (D) Vitamin B12
Explanation: Folate and Vitamin B12 are essential for nucleic acid synthesis. Folate participates in the synthesis of DNA and RNA, while Vitamin B12 is crucial for the regeneration of folate, which allows the continuation of nucleic acid production. Deficiencies in either of these vitamins can lead to impaired DNA synthesis and cell division.