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 radio programs are about conservation? 
Knowledge Triplets: Afield with Ranger Mac, radio.radio_program.first_broadcast, 1933-01
Afield with Ranger Mac, broadcast.content.genre, Children's radio series
Children's radio series, broadcast.genre.content, Afield with Ranger Mac
Afield with Ranger Mac, broadcast.content.genre, Educational Radio
Afield with Ranger Mac, broadcast.content.artist, Wakelin McNeel
Afield with Ranger Mac, user.zsi_editorial.editorial.topic.comments, ZSI on Afield with Ranger Mac
Afield with Ranger Mac, broadcast.content.production_start, 1933-01
Afield with Ranger Mac, broadcast.content.location, Madison
m.05snf2y, award.award_honor.honored_for, Afield with Ranger Mac
Educational Radio, broadcast.genre.content, Afield with Ranger Mac
Afield with Ranger Mac, award.award_winning_work.awards_won, m.05snf2y
Afield with Ranger Mac, broadcast.content.language, English Language
Afield with Ranger Mac, radio.radio_program.subjects, Nature
Wakelin McNeel, broadcast.artist.content, Afield with Ranger Mac
ZSI on Afield with Ranger Mac, user.zsi_editorial.editorial.comment.target, Afield with Ranger Mac
Conservation, radio.radio_subject.programs_with_this_subject, Afield with Ranger Mac
Afield with Ranger Mac, broadcast.content.summary, Children's Radio programming
Nature, radio.radio_subject.programs_with_this_subject, Afield with Ranger Mac
Afield with Ranger Mac, radio.radio_program.subjects, Conservation

Answer: Afield with Ranger Mac