You are an assistant tasked with analyzing medical histories to determine which medication is missing from the patient’s current regimen.

<PatientData>
Demographics: {'race': None, 'gender': 'FEMALE', 'year of birth': 1931}
Visit 1: {'visit': 'Outpatient Visit', 'visit type': 'EHR encounter record', 'start datetime': '1989-05-26', 'end datetime': '1989-05-26'}
Measurement 1: {'measurement': 'Chronic obstructive bronchitis (disorder)', 'measurement type': 'EHR encounter record', 'measurement date': '1989-05-26T00:00:00', 'unit': None, 'value': None}
Current Medications:
Medication 1: {'Drug name': 'Fluticasone propionate 0.25 MG/ACTUAT / salmeterol 0.05 MG/ACTUAT [Advair]', 'Start datetime': '1983-07-02', 'End datetime': '1983-07-02', 'Route': None, 'Quantity': 'Not Extracted', 'Stop Reason': 'Not Extracted', 'Dose Unit': 'Not Extracted'}
</PatientData>

Based on the EHR history above, which medication **should also be on the list today**?

A. 24 HR Metformin hydrochloride 500 MG Extended Release Oral Tablet
B. Allopurinol 100 MG [Zyloprim]
C. Acetaminophen 325 MG / oxyCODONE Hydrochloride 5 MG Oral Tablet
D. NuvaRing 0.12/0.015 MG per 24HR 21 Day Vaginal Ring
E. Errin 28 Day Pack

Please share a single capital letter representing your selected answer: 
24 HR Metformin hydrochloride 500 MG Extended Release Oral Tablet Allopurinol 100 MG [Zyloprim] Acetaminophen 325 MG / oxyCODONE Hydrochloride 5 MG Oral Tablet NuvaRing 0.12/0.015 MG per 24HR 21 Day Vaginal Ring Errin 28 Day Pack