62 yo M is evaluated for a 6 month hx of bilateral lower extremity edema. He was started on furosemide 2 months ago with minimal change in edema. His medical history is notable for permanent pacemaker implantation 2 years ago for symptomatic sinus node dysfunction. He takes no medications other than furosemide.Which of the following conditions could be a potential cause of the bilateral lower extremity edema in this patient?
a) Chronic kidney disease
b) Hypothyroidism
c) Coronary artery disease
d) Chronic obstructive pulmonary disease
