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(A) Thiamine
(B) Ascorbic acid
(C) Riboflavin
(D) Folic acid
Answer: (B) Ascorbic acid
Explanation: Ascorbic acid, commonly known as vitamin C, is not part of the vitamin B complex group. The B complex vitamins include thiamine (B1), riboflavin (B2), and folic acid (B9). Vitamin C is a separate vitamin with different functions, such as acting as an antioxidant and supporting the immune system.