LN is 84 YOM who is in hospital for a back surgery. His height is 5 feet and 4 inches, weight 85 kg and NKDA.His past me

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LN is 84 YOM who is in hospital for a back surgery. His height is 5 feet and 4 inches, weight 85 kg and NKDA.His past medical history includes hypertension, diabetes mellitus, major depression, hypothyroidism and chronic back pain. Post-op day 1, LN"™s medication includes Dexamethasone 8 mg iv q6h with taper dosing, Ondansetron 4 mg iv q6h prn for N/V, Levothyroxine 0.075 mg po daily, Lisinopril 10 mg po daily,Citalopram 20 mg po daily, Docusate sodium / Senna 1 tab po twice a day, Bisacodyl 10 mg suppository daily prn for constipation, Famotidine 20 mg iv q12hr,Metoclopramide 10 mg iv q6h, Metformin 500 mg po bid, D51/2NS with 20K at 125mls/hour and Hydromorphone PCA at 0.2 mg/hour of basal rate, demand dose0.1 mg. lock-out every 6min, one hour limit 2.2 mg/hour. Pertinent morning labs includes serum creatinine 1.4 mg/dl, Mg 1.5 mg/dl, K 5.0 mmol/L, Na 135 mmol/L.Which of the following medication may significantly cause QT prolongation?

A. Lisinopril
B. Levothyroxine
C. Metformin
D. Hydromorphone E. Citalopram