MDD is the correct answer based on the literature showing a higher rate of mortality post-CABG.

Publication reference : Connerney I, Sloan RP et al. Depression is associated with increased mortality 10 years after coronary artery bypass surgery. Psychosomat Med 2010; 72: 874-81
Reference URL: https://www.ncbi.nlm.nih.gov/pubmed/20841558