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: Medicine
Well's grading of puimonary embolism is based ona) Dopplerb) Clinical symptomsc) Hemoptysisd) Heart Rate > 100 beats per min 
Select and explain. 
A. abc, B. acd, C. ac, D. bcd
D: bcd
Answer: D: bcd 
Explanation: None