Query: What is my current medication and when it was last prescribed?, FHIR Resource: {'resourceType': 'Observation', 'status': 'final', 'category': [{'coding': [{'system': 'http://terminology.hl7.org/CodeSystem/observation-category', 'code': 'laboratory', 'display': 'Laboratory'}]}], 'code': {'coding': [{'system': 'http://loinc.org', 'code': '2951-2', 'display': 'Sodium [Moles/volume] in Serum or Plasma'}], 'text': 'Sodium [Moles/volume] in Serum or Plasma'}, 'subject': {'reference': 'urn:uuid:724508c5-a802-d19d-5ccb-4ddf34469b47'}, 'effectiveDateTime': '2021-11-05T19:52:08+05:30', 'valueQuantity': {'value': 139.03, 'unit': 'mmol/L', 'system': 'http://unitsofmeasure.org', 'code': 'mmol/L'}, 'interpretation': None}