Query: What was my blood pressure reading during my last check-up?, 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:514d3cd5-9d59-c1c1-9457-aad183a74c4f'}, 'effectiveDateTime': '2015-09-19T13:15:00+05:30', 'valueQuantity': {'value': 27.86, 'unit': 'kg/m2', 'system': 'http://unitsofmeasure.org', 'code': 'kg/m2'}, 'interpretation': None}