Multiple choice general knowledge science & technology Which of the following helps in clotting of blood? Vitamin B1 Vitamin B2 Vitamin D Vitamin K Reveal answer Fill a bubble to check yourself D Correct answer Explanation Vitamin K is essential for blood clotting as it helps produce clotting factors in the liver. Vitamins B1 (thiamine), B2 (riboflavin), and D are unrelated to coagulation - B vitamins aid metabolism, D regulates calcium.