Query: What was the last vaccination I had and when?, FHIR Resource: {'resourceType': 'Observation', 'status': 'final', 'category': [{'coding': [{'system': 'http://terminology.hl7.org/CodeSystem/observation-category', 'code': 'vital-signs', 'display': 'Vital signs'}]}], 'code': {'coding': [{'system': 'http://loinc.org', 'code': '39156-5', 'display': 'Body mass index (BMI) [Ratio]'}], 'text': 'Body mass index (BMI) [Ratio]'}, 'subject': {'reference': 'urn:uuid:e0c48585-c193-4410-d31f-44bce8786e81'}, 'effectiveDateTime': '2018-07-27T23:03:49+05:30', 'valueQuantity': {'value': 27.92, 'unit': 'kg/m2', 'system': 'http://unitsofmeasure.org', 'code': 'kg/m2'}, 'interpretation': None}