This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Initial treatment for pulmonary embolism is : 
Select and explain. 
A. Fibrinolysis, B. Anticoagulation, C. Surgical embolectomy, D. Venacaval filter
B: Anticoagulation
Answer: B: Anticoagulation 
Explanation: None