diff --git a/Challenge/B/B_29.ttl b/Challenge/B/B_29.ttl
new file mode 100644
index 0000000..b51f173
--- /dev/null
+++ b/Challenge/B/B_29.ttl
@@ -0,0 +1,40 @@
+@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
+@prefix iadopt: <https://w3id.org/iadopt/ont/> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix GrB: <http://www.group.org/iadopt/challengeB/> .
+@prefix owl: <http://www.w3.org/2002/07/owl#> .
+@prefix dc: <http://purl.org/dc/terms/> .
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+
+GrB:29
+  a           iadopt:Variable ;
+  skos:prefLabel  "Anxiety level"@en ;
+  skos:altLabel "Anxiety state"@en ;
+  skos:definition "How nervous, worried, or uneasy someone has felt over a given period of time. It measures the intensity of these feelings, ranging from mild worry to strong nervousness or fear, experienced during this period."@en ;
+  iadopt:hasProperty <http://vocabs.lter-europe.net/EnvThes/10013> ;
+  iadopt:hasObjectOfInterest <https://elsst.cessda.eu/id/2/becf13ae-fa53-4ccc-9830-89cf0d9d25b9> ;
+  iadopt:hasContextObject <http://purl.obolibrary.org/obo/NCBITaxon_9606> ;
+  iadopt:hasConstraint <http://publications.europa.eu/resource/dataset/timeperiod> ;
+.
+
+<http://vocabs.lter-europe.net/EnvThes/10013>
+  a          iadopt:Property ;
+  rdfs:label "level"@en ;
+  .
+
+<https://elsst.cessda.eu/id/2/becf13ae-fa53-4ccc-9830-89cf0d9d25b9>
+  a          iadopt:Entity ;
+  rdfs:label "anxiety"@en ;
+  .
+
+
+<http://purl.obolibrary.org/obo/NCBITaxon_9606>
+  a          iadopt:Entity ;
+  rdfs:label "humans"@en ;
+  .
+
+<http://publications.europa.eu/resource/dataset/timeperiod>
+  a          iadopt:Constraint ;
+  rdfs:label "time period "@en ;
+  iadopt:constrains <https://elsst.cessda.eu/id/2/becf13ae-fa53-4ccc-9830-89cf0d9d25b9> ;
+  .
\ No newline at end of file