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: Who is the governing body for the country that runs power plugs BS 546 have? 
Knowledge Triplets: m.08nyn6h, engineering.mains_power.compatible_plugs, Power plug Type F
m.08nyn6h, engineering.location_with_mains_power.mains_power_standards, Afghanistan
Power plug standard type, type.type.properties, Compatible power systems
m.08nyn6h, engineering.mains_power.location, Afghanistan
Power plug standard type, type.type.expected_by, Type
Islamic republic, government.form_of_government.countries, Iran
Power plug Type C, common.topic.notable_types, Power plug standard type
BS 546, common.topic.notable_for, g.1256d4nr_
Power plug standard type, type.type.expected_by, Compatible plugs
BS-546-3-pin-plugs, common.image.appears_in_topic_gallery, BS 546
Islamic State of Afghanistan, location.country.form_of_government, Islamic republic
First East Turkestan Republic, location.country.form_of_government, Islamic republic
Power plug Type C, engineering.power_plug_standard_type.compatible_power_systems, m.08nyn6h
Power plug Type F, engineering.power_plug_standard_type.compatible_power_systems, m.08nyn6h
Islamic republic, government.form_of_government.countries, First East Turkestan Republic
BS 546, common.topic.notable_types, Power plug standard type
BS 546, engineering.power_plug_standard_type.compatible_power_systems, m.08nyn6h
BS 546, common.topic.article, m.08cmzh
Islamic republic, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0081-6544
Afghanistan, engineering.location_with_mains_power.mains_power_standards, m.08nyn6h
m.08nyn6h, engineering.mains_power.compatible_plugs, BS 546
BS 546, engineering.mains_power.compatible_plugs, m.08nyn6h
Afghanistan, government.form_of_government.countries, Islamic republic
BS 546, common.topic.image, BS-546-3-pin-plugs
Islamic republic, government.form_of_government.countries, Islamic State of Afghanistan
Afghanistan, location.country.form_of_government, Islamic republic
Power plug Type F, common.topic.notable_types, Power plug standard type
Power plug standard type, common.topic.article, m.08nxyfr
Islamic republic, base.schemastaging.context_name.pronunciation, g.125_pty39
Islamic republic, government.form_of_government.countries, Mauritania
Power plug standard type, type.type.properties, Plug standards
Mauritania, location.country.form_of_government, Islamic republic
Power plug standard type, freebase.type_profile.strict_included_types, Topic
Iran, location.country.form_of_government, Islamic republic
Islamic republic, government.form_of_government.countries, Afghanistan
Power plug standard type, type.type.domain, Engineering
m.0r2v41p, dataworld.gardening_hint.last_referenced_by, Islamic republic
m.08nyn6h, engineering.mains_power.compatible_plugs, Power plug Type C
Power plug standard type, freebase.type_hints.included_types, Topic
BS-546-3-pin-plugs, common.image.size, m.02gfzrt

Answer: Islamic republic