Query: What was my heart rate during my last visit?, FHIR Resource: {'resourceType': 'Observation', 'status': 'final', 'category': [{'coding': [{'system': 'http://terminology.hl7.org/CodeSystem/observation-category', 'code': 'social-history', 'display': 'Social history'}]}], 'code': {'coding': [{'system': 'http://loinc.org', 'code': '72166-2', 'display': 'Tobacco smoking status'}], 'text': 'Tobacco smoking status'}, 'subject': {'reference': 'urn:uuid:dbdacc6d-dc6c-16c3-35b3-4c21dd936e72'}, 'effectiveDateTime': '2016-03-17T14:26:46+05:30', 'valueQuantity': None, 'interpretation': None}