*This 68-year-old male smoker presents with fatigue and ptosis?*

*What tests would be appropriate to perform?*

A. erum renin levels

B. Atrial natriuretic peptide

C. Urea breath test

D. Barium meal

E. Injection of edrophonium chloride

F. Colonoscopy

G. Tensilon test

H. Angiotensin Converting Enzyme

I. Chest x-ray

J. VanillylMandelic acid in the urine