Query: What was my Body Mass Index (BMI) measurement in 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': '29463-7', 'display': 'Body Weight'}], 'text': 'Body Weight'}, 'subject': {'reference': 'urn:uuid:7b42f6f1-12a4-7f81-e119-2cb0ac9a231e'}, 'effectiveDateTime': '2019-03-20T00:53:28+05:30', 'valueQuantity': {'value': 5.9, 'unit': 'kg', 'system': 'http://unitsofmeasure.org', 'code': 'kg'}, 'interpretation': None}