Sentence:  What concerns him much more is the relationship of diet to the nation 's No. 1 killer : coronary artery disease , which <WSD>accounts</WSD> for more than half of all heart fatalities and kills 500000 Americans a year - twice the toll from all varieties of cancer , five times the deaths from automobile accidents . 
Meaning of the word marked with <WSD> tags:  be the reason or explanation for