During the process of blood coagulation, vitamin K helps in

Options

A. (a) Formation of thromboplastin
B. (b) Formation of prothrombin
C. (c) Conversion of prothrombin to thrombin
D. (d) Conversion of fibrinogen to fibrin

Answer

**Step-by-Step Solution:**

1. **Understanding Blood Coagulation**: Blood coagulation is the process that prevents excessive bleeding by forming blood clots. It involves various proteins and factors that work together to stop bleeding.

2. **Role of Vitamin K**: Vitamin K is essential in the blood coagulation process. It acts as a cofactor for enzymes that are necessary for the synthesis of specific clotting factors in the liver.

3. **Synthesis of Prothrombin**: One of the key factors that Vitamin K helps produce is prothrombin, also known as factor II. Prothrombin is crucial for the coagulation process as it is converted into thrombin, which then helps in the formation of fibrin.

4. **Other Factors Produced**: In addition to prothrombin, Vitamin K is involved in the synthesis of other clotting factors, including factor VII (stable factor), factor IX (Christmas factor), and factor X (Stuart-Prower factor).

5. **Identifying the Correct Answer**: From the options provided:
- A: Formation of thromboplastin (incorrect)
- B: Formation of prothrombin (correct)
- C: Conversion of prothrombin to thrombin (incorrect)
- D: Conversion of fibrinogen to fibrin (incorrect)

The correct answer is **B: Formation of prothrombin**.