This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematology, Subject name: Pharmacology
Anticoagulant of choice for prophylaxis of venous thromboembolism in patient with cancer surgery is:- 
Select and explain. 
A. Heparin sulfate, B. Protamine sulfate, C. Low molecular weight heparin, D. Warfarin
C: Low molecular weight heparin
Answer: C: Low molecular weight heparin 
Explanation: Venous Thromboembolism- precipitating factor -estrogen in females PREVENTION OF Venous Thromboembolism AMONG HOSPITALIZED PATIENTS Condition Prophylaxis High risk non - ohopedic surgery Unfractionated heparin Low molecular weight heparin (LMWH) Cancer surgery(associated thromboembolism ) LMWH Major ohopedic surgery Warfarin LMWH Aspirin Factor Xa inhibitors (Apixaban) Dabigatran Medically ill patients during hospitalization Unfractionated heparin LMWH Medically ill patients after hospitalization Betrixaban