Query: What medication was I prescribed on 2021-03-07?, 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': '38483-4', 'display': 'Creatinine [Mass/volume] in Blood'}], 'text': 'Creatinine [Mass/volume] in Blood'}, 'subject': {'reference': 'urn:uuid:57d7bafe-dd9a-5d19-847c-a6743f31a3ee'}, 'effectiveDateTime': '2019-07-07T23:25:17+05:30', 'valueQuantity': {'value': 1.28, 'unit': 'mg/dL', 'system': 'http://unitsofmeasure.org', 'code': 'mg/dL'}, 'interpretation': None}