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: western campaigner belongs to what class? 
Knowledge Triplets: British Rail Class 52, rail.locomotive_class.uic_classification, C'C'
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Trooper
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Governor
Western Patriarch, rail.locomotive.locomotive_class, British Rail Class 52
Western Prince, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Ruler
Western Chieftain, rail.locomotive.locomotive_class, British Rail Class 52
Western Dragoon, rail.locomotive.locomotive_class, British Rail Class 52
Western Monitor, rail.locomotive.locomotive_class, British Rail Class 52
Western Queen, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Lord
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Campaigner
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Sultan
Western Cavalier, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Harrier
Western Musketeer, rail.locomotive.locomotive_class, British Rail Class 52
Western Emperor, rail.locomotive.locomotive_class, British Rail Class 52
Western Huntsman, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Ambassador
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Envoy
Western Dominion, rail.locomotive.locomotive_class, British Rail Class 52
Western Guardsman, rail.locomotive.locomotive_class, British Rail Class 52
Western Governor, rail.locomotive.locomotive_class, British Rail Class 52
Western Thunderer, rail.locomotive.locomotive_class, British Rail Class 52
Western Glory, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Viscount
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Centurion
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western King
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Hero
British Rail Class 52, rail.locomotive_class.introduced, 1961
Western Ranger, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Legionnaire
Western Regent, rail.locomotive.locomotive_class, British Rail Class 52
Western Duchess, rail.locomotive.locomotive_class, British Rail Class 52
Western Sovereign, rail.locomotive.locomotive_class, British Rail Class 52
Western Lady, rail.locomotive.locomotive_class, British Rail Class 52
Western Gladiator, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Musketeer
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Viceroy
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Pathfinder
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Glory
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Dragoon
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Queen
Western Reliance, rail.locomotive.locomotive_class, British Rail Class 52
Western Viscount, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Talisman
Western Bulwark, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Warrior
Western Empress, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Prince
Western Pioneer, rail.locomotive.locomotive_class, British Rail Class 52
Western Stalwart, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Thunderer
Western Druid, rail.locomotive.locomotive_class, British Rail Class 52
Western Princess, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Vanguard
Western Champion, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Buccaneer
Western Nobleman, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Druid
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Nobleman
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Princess
Western Marquis, rail.locomotive.locomotive_class, British Rail Class 52
Western Leviathan, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Enterprise
Western Marksman, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Reliance
Western Gauntlet, rail.locomotive.locomotive_class, British Rail Class 52
Western King, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Yeoman
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Sovereign
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Dominion
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Lancer
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Huntsman
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Monitor
Western Invader, rail.locomotive.locomotive_class, British Rail Class 52
Western Challenger, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Cavalier
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Champion
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Regent
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Advocate
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Gauntlet
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Pioneer
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Firebrand
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Guardsman
Western Ambassador, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Ranger
Western Buccaneer, rail.locomotive.locomotive_class, British Rail Class 52
Western Advocate, rail.locomotive.locomotive_class, British Rail Class 52
Western Courier, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Bulwark
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Marksman
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Lady
Western Venturer, rail.locomotive.locomotive_class, British Rail Class 52
Western Fusilier, rail.locomotive.locomotive_class, British Rail Class 52
Western Sultan, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Duke
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Monarch
Western Enterprise, rail.locomotive.locomotive_class, British Rail Class 52
Western Duke, rail.locomotive.locomotive_class, British Rail Class 52
Western Firebrand, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Explorer
Western Sentinel, rail.locomotive.locomotive_class, British Rail Class 52
Western Consort, rail.locomotive.locomotive_class, British Rail Class 52
Western Vanguard, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Renown
Western Hussar, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Patriarch
Western Centurion, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Leviathan
Western Legionnaire, rail.locomotive.locomotive_class, British Rail Class 52
Western Lancer, rail.locomotive.locomotive_class, British Rail Class 52
Western Lord, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Empire
Western Campaigner, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Hussar
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Venturer
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Crusader
Western Harrier, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Gladiator
Western Rifleman, rail.locomotive.locomotive_class, British Rail Class 52
Western Empire, rail.locomotive.locomotive_class, British Rail Class 52
Western Envoy, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Duchess
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Sentinel
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Invader
Western Renown, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Fusilier
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Challenger
Western Warrior, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Emperor
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Stalwart
Western Viceroy, rail.locomotive.locomotive_class, British Rail Class 52
Western Pathfinder, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Empress
Western Trooper, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Consort
Western Yeoman, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Prefect
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Courier
Western Prefect, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Marquis
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Rifleman
Western Monarch, rail.locomotive.locomotive_class, British Rail Class 52
Western Crusader, rail.locomotive.locomotive_class, British Rail Class 52
Western Hero, rail.locomotive.locomotive_class, British Rail Class 52
Western Talisman, rail.locomotive.locomotive_class, British Rail Class 52
Western Ruler, rail.locomotive.locomotive_class, British Rail Class 52
Western Explorer, rail.locomotive.locomotive_class, British Rail Class 52
British Rail Class 52, rail.locomotive_class.locomotives_of_this_class, Western Chieftain

Answer: British Rail Class 52