Query: What was the result of my last Syphilis test?, 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': '8302-2', 'display': 'Body Height'}], 'text': 'Body Height'}, 'subject': {'reference': 'urn:uuid:fa9ef1cf-f8c8-64b8-c88a-db2e07f39a28'}, 'effectiveDateTime': '1984-07-18T18:28:02+05:30', 'valueQuantity': {'value': 161.7, 'unit': 'cm', 'system': 'http://unitsofmeasure.org', 'code': 'cm'}, 'interpretation': None}