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: Social & Preventive Medicine
Vitamin synthesized by bacteria in the intestine is: March 2004 
Select and explain. 
A. Vitamin K, B. Vitamin B1, C. Vitamin D, D. Biotin
A: Vitamin K
Answer: A: Vitamin K 
Explanation: Ans. A i.e. Vitamin K