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': 'MALE', 'year of birth': 1930}
Visit 1: {'visit': 'Outpatient Visit', 'visit type': 'EHR encounter record', 'start datetime': '1993-10-29', 'end datetime': '1993-10-29'}
Measurement 1: {'measurement': 'Stroke', 'measurement type': 'EHR encounter record', 'measurement date': '1993-10-29T00:00:00', 'unit': None, 'value': None}
Current Medications:
Medication 1: {'Drug name': 'Penicillin V Potassium 250 MG', 'Start datetime': '1932-07-27', 'End datetime': '1932-07-27', 'Route': None, 'Quantity': 'Not Extracted', 'Stop Reason': 'Not Extracted', 'Dose Unit': 'Not Extracted'}
Medication 2: {'Drug name': 'Penicillin V Potassium 500 MG', 'Start datetime': '1958-01-13', 'End datetime': '1958-01-13', 'Route': None, 'Quantity': 'Not Extracted', 'Stop Reason': 'Not Extracted', 'Dose Unit': 'Not Extracted'}
Medication 3: {'Drug name': 'Naproxen sodium 220 MG [Aleve]', 'Start datetime': '1959-05-15', 'End datetime': '1959-05-15', 'Route': None, 'Quantity': 'Not Extracted', 'Stop Reason': 'Not Extracted', 'Dose Unit': 'Not Extracted'}
Medication 4: {'Drug name': 'Penicillin V Potassium 500 MG', 'Start datetime': '1976-07-21', 'End datetime': '1976-07-21', '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. Naproxen sodium 550 MG [Anaprox]
B. 24 HR Metformin hydrochloride 500 MG Extended Release Oral Tablet
C. Acetaminophen 325 MG Oral Tablet
D. Terfenadine 60 MG Oral Tablet
E. Memantine hydrochloride 2 MG/ML [Namenda]

Please share a single capital letter representing your selected answer: 
Naproxen sodium 550 MG [Anaprox] 24 HR Metformin hydrochloride 500 MG Extended Release Oral Tablet Acetaminophen 325 MG Oral Tablet Terfenadine 60 MG Oral Tablet Memantine hydrochloride 2 MG/ML [Namenda]