Query: What was the last lab test I had and what were the results?, 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': '2093-3', 'display': 'Cholesterol [Mass/volume] in Serum or Plasma'}], 'text': 'Cholesterol [Mass/volume] in Serum or Plasma'}, 'subject': {'reference': 'urn:uuid:152488e2-85f6-45f7-dbfe-b1b77742b4f7'}, 'effectiveDateTime': '2020-10-01T06:13:35+05:30', 'valueQuantity': {'value': 258.26, 'unit': 'mg/dL', 'system': 'http://unitsofmeasure.org', 'code': 'mg/dL'}, 'interpretation': None}