A nurse is teaching a client who has a vitamin K deficiency about the effects of vitamin K. Which of the following information should the nurse include in the teaching?

Rationale: A. Vitamin K is produced in the liver: The liver stores vitamin K but does not produce it. Vitamin K is synthesized mainly by intestinal bacteria and obtained from dietary sources such as leafy green vegetables. B. Vitamin K promotes fibrinogen formation: Fibrinogen is produced by the liver and does not require vitamin K for its synthesis. Vitamin K is instead essential for the activation of clotting factors II, VII, IX, and X. C. Vitamin K is produced in the gastric juices: Gastric juices aid digestion but do not produce vitamin K. Intestinal flora in the colon synthesize vitamin K, which contributes to the body’s stores. D. Vitamin K reverses warfarin toxicity: Vitamin K acts as an antidote to warfarin because it restores the synthesis of vitamin K–dependent clotting factors. This property is clinically used to manage excessive anticoagulation and bleeding related to warfarin therapy.