Which of the following medications is used as an anticoagulant by inhibiting the synthesis of vitamin K-dependent coagulation factors?

A Warfarin ✓
B Heparin
C Aspirin
D Ticlopidine

Explanation

Warfarin acts as an anticoagulant by inhibiting the synthesis of vitamin K-dependent coagulation factors, including factors II, VII, IX, and X.

Source

Pharmacology and Therapeutics, 11th edition
Hematology Hematology: Coagulation Disorders Hematology: Coagulation Disorders Medium MEDICAL Confidence: high