Query: When was my last blood pressure check-up?, FHIR Resource: {'resourceType': 'Observation', 'status': 'final', 'category': [{'coding': [{'system': 'http://terminology.hl7.org/CodeSystem/observation-category', 'code': 'exam', 'display': 'Exam'}]}, {'coding': [{'system': 'http://hl7.org/fhir/us/core/CodeSystem/us-core-observation-category', 'code': 'clinical-test', 'display': 'Clinical Test'}]}], 'code': {'coding': [{'system': 'http://loinc.org', 'code': '75636-1', 'display': 'Emergency severity index'}], 'text': 'Emergency severity index'}, 'subject': {'reference': 'urn:uuid:57a36428-c472-8b2c-3075-ee78637252c9'}, 'effectiveDateTime': '2023-03-31T15:23:12+05:30', 'valueQuantity': None, 'interpretation': None}