Question

Blood clotting in human body is caused due to the deficiency of

• A. Vitamin K
• B. Vitamin A
• C. Vitamin B 12
• D. Vitamin D

Hint:

Vitamin K deficiency *prevents* or slows down blood clotting. The flawed framing of the question statement led to its official cancellation.

Answer 1

The Correct Option is A

Concept:
Blood clotting is a natural process that prevents excessive bleeding when a blood vessel is injured. Vitamin K is essential for the synthesis of several clotting factors (such as Prothrombin and Factors VII, IX, and X) in the liver. A deficiency of Vitamin K impairs the blood clotting mechanism, leading to prolonged bleeding. 

Step 1: Understand the role of Vitamin K. Vitamin K is required for the production of clotting proteins in the liver. Without sufficient Vitamin K, the body cannot produce these proteins effectively, resulting in delayed or impaired blood clotting. 

Step 2: Evaluate the options.

• (A) Vitamin K ✔️ Correct. Deficiency of Vitamin K reduces the production of blood clotting factors, leading to excessive bleeding.
• (B) Vitamin A ✖️ Incorrect. Vitamin A is essential for normal vision, healthy skin, and immune function. It is not directly involved in blood clotting.
• (C) Vitamin B₁₂ ✖️ Incorrect. Vitamin B₁₂ is necessary for red blood cell formation and proper nervous system function. Its deficiency causes megaloblastic anemia, not impaired blood clotting.
• (D) Vitamin D ✖️ Incorrect. Vitamin D helps in calcium absorption and maintains healthy bones and teeth. It is not responsible for blood clotting.

Final Answer: \[ \boxed{\text{(A) Vitamin K}} \]