A. Vitamin K
A.
B. Vitamin B12
B.
C. Vitamin A
C.
D. Vitamin D
D.
Correct Answer: A
সঠিক উত্তর: A
Explanation
ব্যাখ্যা
While some bacteria in the large intestine can produce certain B vitamins, Vitamin K is the primary vitamin synthesized there, playing a crucial role in blood clotting.