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: name the video game rating system which has a content discriptor use of drugs? 
Knowledge Triplets: Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Intense Violence
m.0cv45v6, organization.organization_relationship.child, Entertainment Software Rating Board
Sexual Content, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
m.0cv5589, organization.organization_relationship.child, Entertainment Software Rating Board
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Nudity
Entertainment Software Rating Board, organization.organization.sectors, Video game industry
Animated Blood, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Real Gambling, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, organization.organization.headquarters, m.0wk_8xw
Mature Humor, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Language, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Violence
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Blood
Entertainment Software Rating Board, organization.organization.parent, m.0cv4clr
Entertainment Software Rating Board, organization.organization.sectors, Video game
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Strong Sexual Content
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Animated Blood
Entertainment Software Rating Board, base.schemastaging.context_name.pronunciation, g.125_q0t7g
Comic Mischief, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Sexual Themes, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Simulated Gambling
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Fantasy Violence
Blood, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Video game, organization.organization_sector.organizations_in_this_sector, Entertainment Software Rating Board
Entertainment Software Rating Board, cvg.computer_game_rating_system.ratings, Early Childhood
Simulated Gambling, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Sexual Violence, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Suggestive Themes
Teen, cvg.computer_game_rating.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Crude Humor
Entertainment Software Rating Board, cvg.computer_game_rating_system.ratings, Everyone 10+
Entertainment Software Rating Board, cvg.computer_game_rating_system.ratings, Adults Only
Content rating, organization.organization_sector.organizations_in_this_sector, Entertainment Software Rating Board
Entertainment Software Rating Board, organization.organization.parent, m.0cv45v6
Partial Nudity, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Cartoon Violence
Intense Violence, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, cvg.computer_game_rating_system.ratings, Kids to Adults
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Strong Language
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Lyrics
Entertainment Software Rating Board, cvg.computer_game_rating_system.ratings, Everyone
Violence, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Blood and Gore
Entertainment Software Rating Board, cvg.computer_game_rating_system.ratings, Rating Pending
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Mature Humor
Cartoon Violence, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Strong Lyrics, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Partial Nudity
Tobacco Reference, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, organization.organization.place_founded, Canada
m.0cv4clr, organization.organization_relationship.child, Entertainment Software Rating Board
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Sexual Themes
Entertainment Software Rating Board, organization.organization.date_founded, 1994
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Drug Reference
Entertainment Software Rating Board, cvg.computer_game_rating_system.ratings, Mature
Mature, cvg.computer_game_rating.rating_system, Entertainment Software Rating Board
Fantasy Violence, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Video game industry, organization.organization_sector.organizations_in_this_sector, Entertainment Software Rating Board
Adults Only, cvg.computer_game_rating.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, organization.organization.sectors, Content rating
Crude Humor, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0081-76d1
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Language
Everyone, cvg.computer_game_rating.rating_system, Entertainment Software Rating Board
Rating Pending, cvg.computer_game_rating.rating_system, Entertainment Software Rating Board
Alcohol Reference, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Use of Drugs
Suggestive Themes, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Violent References, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Early Childhood, cvg.computer_game_rating.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Sexual Content
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Use of Alcohol
Entertainment Software Rating Board, organization.organization.parent, m.0cv5589
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Use of Tobacco
m.0cv3qj0, organization.organization_relationship.child, Entertainment Software Rating Board
Entertainment Software Rating Board, organization.organization.parent, m.0cv52vb
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Violent References
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Sexual Violence
Entertainment Software Rating Board, organization.organization.parent, m.0cv3qj0
Strong Language, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Drug Reference, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Lyrics, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Strong Sexual Content, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, cvg.computer_game_rating_system.ratings, Teen
Nudity, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
m.0cv52vb, organization.organization_relationship.child, Entertainment Software Rating Board
Everyone 10+, cvg.computer_game_rating.rating_system, Entertainment Software Rating Board
Blood and Gore, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Use of Alcohol, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Strong Lyrics
Kids to Adults, cvg.computer_game_rating.rating_system, Entertainment Software Rating Board
Use of Drugs, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Comic Mischief
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Real Gambling
Use of Tobacco, cvg.computer_game_content_descriptor.rating_system, Entertainment Software Rating Board
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Tobacco Reference
Entertainment Software Rating Board, cvg.computer_game_rating_system.content_descriptors, Alcohol Reference

Answer: Entertainment Software Rating Board