user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: which geographical scope belongs to the conference series which is the subject of qa and testing on embedded systems? 
Knowledge Triplets: QA and Testing on Embedded Systems, conferences.conference_subject.series_of_conferences_about_this, QA&Test
QA&Test 2009, conferences.conference.series, QA&Test
QA&Test, conferences.conference_series.conference, QA&Test 2009
Bilbao, base.events.geographical_scope.conferences_and_conventions_with_this_geographic_scope, QA&Test
QA&Test, conferences.conference_series.subject, QA and Testing on Embedded Systems
QA and Testing on Embedded Systems, conferences.conference_series.subject, QA&Test
QA&Test, conferences.conference_series.geographical_scope, Bilbao
QA&Test, conferences.conference_series.sponsoring_organization, SQS,S.A
SQS,S.A, conferences.conference_sponsor.conferences, QA&Test

Answer: Bilbao