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 is the radio format for the station that broadcasts the prairie was quiet? 
Knowledge Triplets: The Prairie was Quiet, award.award_winning_work.awards_won, m.05v0wcc
KSJN, broadcast.radio_format.stations, Classical music
KSJN, broadcast.radio_station.founded, 1940
KSJN, broadcast.radio_station.format, Public broadcasting
KSJN, broadcast.radio_station.affiliations, m.065r49t
initial_review, user.zsi_editorial.editorial.tag.comments, ZSI on The Prairie was Quiet
KSJN, broadcast.broadcast.area_served, Minneapolis
ZSI on The Prairie was Quiet, user.zsi_editorial.editorial.comment.editorial_tags, initial_review
KSJN, award.award_winner.awards_won, m.05v0wcc
m.0zfp_7q, award.award_honor.award_winner, KSJN
m.05v0wcc, award.award_honor.year, 1977
Minnesota Public Radio, broadcast.radio_station_owner.radio_stations, KSJN
KSJN, organization.organization.place_founded, Minnesota
1978 Peabody Awards Ceremony, award.award_ceremony.awards_presented, m.05v0wcc
KSJN, broadcast.radio_station.owner, Minnesota Public Radio
The Prairie was Quiet, broadcast.broadcast.content, KSJN
KSJN, organization.organization.date_founded, 1945
KSJN, broadcast.broadcast.content, The Prairie was Quiet
KSJN, award.award_winner.awards_won, m.0zfp_7q
m.05v0wcc, award.award_honor.ceremony, 1978 Peabody Awards Ceremony
ZSI, user.zsi_editorial.editorial.editor.comments, ZSI on The Prairie was Quiet
m.05v0wcc, award.award_honor.award_winner, KSJN
The Prairie was Quiet, broadcast.content.broadcast, KSJN
m.05v0wcc, award.award_honor.honored_for, The Prairie was Quiet
KSJN, organization.organization.headquarters, m.0zfsktm
needs_approval, user.zsi_editorial.editorial.tag.comments, ZSI on The Prairie was Quiet
Classical music, broadcast.radio_format.stations, KSJN
ZSI on The Prairie was Quiet, user.zsi_editorial.editorial.comment.editorial_tags, needs_approval
The Prairie was Quiet, user.zsi_editorial.editorial.topic.comments, ZSI on The Prairie was Quiet
m.05v0wcc, award.award_honor.award, Peabody Award
KSJN, broadcast.radio_station.format, Classical music
m.0zgynj_, broadcast.radio_affiliation_duration.station, KSJN
ZSI on The Prairie was Quiet, type.object.permission, m.03mk2pl
m.065r49t, broadcast.radio_affiliation_duration.station, KSJN
KSJN, broadcast.broadcast.area_served, Minneapolis–Saint Paul
m.03mk2pl, type.permission.controls, ZSI on The Prairie was Quiet
ZSI on The Prairie was Quiet, user.zsi_editorial.editorial.comment.target, The Prairie was Quiet
Public broadcasting, broadcast.radio_format.stations, KSJN
Peabody Award, award.award_category.winners, m.05v0wcc
ZSI on The Prairie was Quiet, user.zsi_editorial.editorial.comment.editor, ZSI
KSJN, broadcast.radio_station.affiliations, m.0zgynj_

Answer: Classical music
Public broadcasting