Query: When was my last vaccination and what was it for?, 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': '786-4', 'display': 'MCHC [Mass/volume] by Automated count'}], 'text': 'MCHC [Mass/volume] by Automated count'}, 'subject': {'reference': 'urn:uuid:c43f2f49-ca86-ead4-1dc9-1c35fe10937d'}, 'effectiveDateTime': '2021-07-24T17:23:25+05:30', 'valueQuantity': {'value': 35.635, 'unit': 'g/dL', 'system': 'http://unitsofmeasure.org', 'code': 'g/dL'}, 'interpretation': None}