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: what video game is social innovation the subject of? 
Knowledge Triplets: Evoke, cvg.computer_videogame.subjects, Social innovation
Social innovation, organization.organization_sector.organizations_in_this_sector, m.011vjr8d
Fundraising, organization.organization_sector.organizations_in_this_sector, m.012vkl87
m.011vjr8d, organization.organization.sectors, Fundraising
Jane McGonigal, cvg.cvg_designer.games_designed, Evoke
Non-profit organization, organization.organization_sector.organizations_in_this_sector, m.012vkl87
Money, cvg.computer_game_subject.games, Evoke
m.011vjr8d, organization.organization.headquarters, m.011wyp4f
m.011vjr8d, organization.organization.sectors, Website
m.011vjr8d, organization.organization.date_founded, 2011-12
Food security, cvg.computer_game_subject.games, Evoke
Website, organization.organization_sector.organizations_in_this_sector, m.011vjr8d
Social innovation, organization.organization_sector.organizations_in_this_sector, m.012vkl87
m.011vjr8d, organization.organization.email, m.011wyp_0
m.011vjr8d, organization.organization.email, m.011wypz9
m.011vjr8d, organization.organization.organization_type, Limited liability company
Crowdfunding, organization.organization_sector.organizations_in_this_sector, m.011vjr8d
Italy, business.business_location.parent_company, m.011vjr8d
Fundraising, organization.organization_sector.organizations_in_this_sector, m.011vjr8d
Evoke, cvg.computer_videogame.cvg_genre, Serious game
m.012vkl87, internet.website.category, Crowdfunding
Active, internet.website_status.sites, m.012vkl87
m.011vjr8d, organization.organization.locations, Italy
m.012vkl87, organization.organization.sectors, Fundraising
Water, cvg.computer_game_subject.games, Evoke
m.011vjr8d, organization.organization.sectors, Non-profit organization
m.012vkl87, organization.organization.sectors, Social innovation
Evoke, cvg.computer_videogame.release_date, 2010-03-03
m.011vjr8d, organization.organization.sectors, Social innovation
Limited liability company, organization.organization_type.organizations_of_this_type, m.011vjr8d
Crowdfunding, organization.organization_sector.organizations_in_this_sector, m.012vkl87
m.012vkl87, organization.organization.headquarters, m.012vklgk
m.012vkl87, organization.organization.email, m.012vklj3
m.012vkl87, internet.website.status, Active
m.011vjr8d, organization.organization.sectors, Crowdfunding
Evoke, cvg.computer_videogame.designers, Jane McGonigal
Social innovation, cvg.computer_game_subject.games, Evoke
m.012vkl87, organization.organization.sectors, Non-profit organization
Evoke, cvg.computer_videogame.subjects, Money
m.012vkl87, organization.organization.date_founded, 2011-12
Serious game, cvg.cvg_genre.games, Evoke
Evoke, cvg.computer_videogame.subjects, Water
Social innovation, cvg.computer_videogame.subjects, Evoke
m.011vjr8d, organization.organization.email, m.011wypxd
m.012vkl87, organization.organization.sectors, Crowdfunding
Crowdfunding, internet.website_category.sites, m.012vkl87
Evoke, cvg.computer_videogame.subjects, Food security
m.012vkl87, organization.organization.place_founded, Turin
Non-profit organization, organization.organization_sector.organizations_in_this_sector, m.011vjr8d

Answer: Evoke