Question

Which of the following is true about vitamin K ?

• A. Anticoagulant
• B. Prolong use of antimicrobial leads to deficiency
• C. Dietary allowance is 15-20 mg
• D. All of the above

Answer 1

The Correct Option is B

Step 1: Establish the function. Vitamin K is required for the liver to make prothrombin and the other vitamin-K-dependent clotting factors, making it essential for coagulation rather than an anticoagulant.

Step 2: Validate the antibiotic link. Intestinal bacteria contribute a meaningful share of vitamin K. Long courses of antibiotics suppress these bacteria, lowering vitamin K availability and risking deficiency, especially with poor dietary intake. This option holds true.

Step 3: Discard the wrong options. Labeling it an anticoagulant inverts its true clot-promoting action. The stated requirement of 15-20 mg confuses milligrams with the correct microgram-range allowance. Both are false.

Only the antibiotic-deficiency statement survives scrutiny.\[\boxed{\text{Prolonged antimicrobial use leads to deficiency}}\]