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: Biochemistry
Vitamin which is excreted in urine is : 
Select and explain. 
A. Vitamin A, B. Vitamin C, C. Vitamin D, D. Vitamin K
B: Vitamin C
Answer: B: Vitamin C 
Explanation: B i.e. Vitamin CVitamin C is a water soluble vitamin, which is mainly excreted in urineQ. Its intake above 100 mg/day results in saturation of its metabolic capacity and excretion into urine. So large doses (1 gm TDS/81p) are used to acidify urine in preventing and treating UTI as some drugs act better in acidic urine.Vitamin A, D, E, K are fat soluble and so excreted mainly in bile and very minimally in urine.