Which of the following vitamins helps in blood clotting?
ক
Vitamin A
খ
Vitamin C
গ
Vitamin D
ঘ
Vitamin K
সঠিক উত্তর: Vitamin K
Vitamin K helps to make various proteins that are needed for blood clotting and the building of bones. Prothrombin is a vitamin K-dependent protein directly involved with blood clotting.