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: troy ounce is measured using what unit of mass? 
Knowledge Triplets: Battle of the Catalaunian Plains, time.event.locations, Troyes
Troyes, location.location.people_born_here, Patrick Moya
Pierre Pithou, people.person.place_of_birth, Troyes
Troyes, location.location.people_born_here, Patrick Henry affair
Troyes, location.location.people_born_here, Celine Lecompere
Troyes, location.location.people_born_here, Louis Ulbach
Belina, people.deceased_person.place_of_death, Troyes
Mathieu Drujon, people.person.place_of_birth, Troyes
Troy ounce, measurement_unit.mass_unit.measurement_system, Troy weight
Troyes, location.location.people_born_here, Armand de Las Cuevas
Troyes, location.location.people_born_here, Maurice Marinot
Theobald III, Count of Champagne, people.deceased_person.place_of_death, Troyes
Troyes, location.capital_of_administrative_division.capital_of, m.0jvvljb
Troyes, location.location.people_born_here, Hugues de Payens
Troyes, base.schemastaging.location_extra.elevation_min, 100.0
Troyes, location.location.people_born_here, Serkan Yanık
Grain, measurement_unit.mass_unit.weightmass_in_kilograms, 6.479891e-05
Jacques Carrey, people.deceased_person.place_of_death, Troyes
Troyes, location.location.people_born_here, Jean Tirole
Troyes, location.location.people_born_here, Marguerite Bourgeoys
Jean Tirole, people.person.place_of_birth, Troyes
Troyes, location.location.people_born_here, Hervé Schreiner
Theobald I of Navarre, people.person.place_of_birth, Troyes
US customary units, measurement_unit.measurement_system.weight_units, Grain
Yannick Stopyra, people.person.place_of_birth, Troyes
Troyes, location.location.nearby_airports, Troyes – Barberey Airport
Yocheved, people.person.place_of_birth, Troyes
Édouard Herriot, people.person.place_of_birth, Troyes
Troyes, location.location.people_born_here, Rashi
Troyes, location.location.people_born_here, Pierre de Bérulle
Troy weight, measurement_unit.measurement_system.weight_units, Pennyweight
Troyes, base.feudalism.fief.owners, m.07nft0b
Michel Marot, people.person.place_of_birth, Troyes
Troyes, location.location.people_born_here, Petrus Comestor
Catherine Lemorton, people.person.place_of_birth, Troyes
Thierry Laurey, people.person.place_of_birth, Troyes
m.0wlnm85, people.place_lived.location, Troyes
Troyes, location.location.containedby, Aube
Miriam, people.person.place_of_birth, Troyes
Troyes, location.location.people_born_here, Nicolas Mignard
Abdoul Sissoko, people.person.place_of_birth, Troyes
m.0wls2r8, people.place_lived.location, Troyes
Marie de Sales Chappuis, people.deceased_person.place_of_death, Troyes
m.0whgn_0, people.place_lived.location, Troyes
troy.noun.01, base.wordnet.synset.syntactic_category, Noun
Troyes, location.location.people_born_here, Alex Jeannin
Nicolas Mignard, people.person.place_of_birth, Troyes
Gaëtane Thiney, people.person.place_of_birth, Troyes
Jean-Marie Bigard, people.person.place_of_birth, Troyes
Troyes, symbols.name_source.namesakes, Troy weight
A5 autoroute, transportation.road.major_cities, Troyes
Troyes, location.location.people_born_here, Philibert Orry
University of Technology of Troyes, location.location.containedby, Troyes
troy unit.noun.01, base.wordnet.synset.part_holonym, troy.noun.01
François Girardon, people.person.place_of_birth, Troyes
Troyes, location.location.area, 13.2
Troyes, location.location.people_born_here, Didier Bienaimé
Troyes, location.location.events, Battle of the Catalaunian Plains
Troyes, location.location.people_born_here, Guillaume Le Bé
m.0wlddtd, people.place_lived.location, Troyes
Troyes, location.location.people_born_here, Jérôme Simon
Troyes, location.location.people_born_here, Yannick Stopyra
m.07r50hc, base.wordnet.word_sense.sense, troy.noun.01
Grain, measurement_unit.mass_unit.measurement_system, Troy weight
Troyes, location.location.people_born_here, Patroclus of Troyes
system of weights.noun.01, base.wordnet.synset.hyponymy, troy.noun.01
Troyes, location.location.people_born_here, Pope Urban IV
m.0wk7v2t, people.place_lived.location, Troyes
Troyes, location.location.people_born_here, Jaoid Chiguer
grain.noun.09, base.wordnet.synset.equivalent_topic, Grain
Pennyweight, measurement_unit.mass_unit.weightmass_in_kilograms, 0.00155517384
g.1229dsz_, location.location.containedby, Troyes
Henry I, Count of Champagne, people.deceased_person.place_of_death, Troyes
Troyes, topic_server.population_number, 60009
Troyes, location.location.people_born_here, Jules Édouard Valtat
Troyes, location.location.people_born_here, Edmond Auger
Celine Lecompere, people.person.place_of_birth, Troyes
Marguerite Bourgeoys, people.person.place_of_birth, Troyes
Troyes, location.location.people_born_here, Ernest Neuhard
Mass, measurement_unit.dimension.units, Troy pound
Rashi, people.person.place_of_birth, Troyes
m.0wh9pj_, people.place_lived.location, Troyes
Philibert Orry, people.person.place_of_birth, Troyes
Patrick Moya, people.person.place_of_birth, Troyes
Troyes, location.location.people_born_here, Chrétien de Troyes
Troyes, location.location.contains, University of Technology of Troyes
Baptiste Martin, people.person.place_of_birth, Troyes
Lucien Petit-Breton, people.deceased_person.place_of_death, Troyes
Troyes, location.location.people_born_here, Mathieu Drujon
Roger Lion, people.person.place_of_birth, Troyes
Troy pound, measurement_unit.mass_unit.weightmass_in_kilograms, 0.3732417216
Troyes, location.location.people_born_here, Roger Lion
Chrétien de Troyes, people.person.place_of_birth, Troyes
Mohamed Bradja, people.person.place_of_birth, Troyes
Troyes, location.location.people_born_here, François Marque
m.0whs2rm, people.place_lived.location, Troyes
Rabbeinu Tam, people.deceased_person.place_of_death, Troyes
Grain, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0081-6245
m.0wlv2xj, people.place_lived.location, Troyes
Jules Édouard Valtat, people.person.place_of_birth, Troyes
m.07nft0b, base.feudalism.fief_ownership.fief, Troyes
Claude Renoir, people.deceased_person.place_of_death, Troyes
Troyes, location.location.contains, Musée des beaux-arts de Troyes
m.0wh147r, people.place_lived.location, Troyes
Troy weight, measurement_unit.measurement_system.weight_units, Grain
Mass, measurement_unit.dimension.units, Pennyweight
m.0wkzsxs, people.place_lived.location, Troyes
m.0whg_py, people.place_lived.location, Troyes
Aube, base.aareas.schema.administrative_area.capital, Troyes
Troyes, location.location.people_born_here, Theobald III, Count of Champagne
m.0wg_9_k, people.place_lived.location, Troyes
Nicolas Siret, people.deceased_person.place_of_death, Troyes
Jacques de Létin, people.person.place_of_birth, Troyes
m.0wlr86g, people.place_lived.location, Troyes
Patroclus of Troyes, people.deceased_person.place_of_death, Troyes
m.011p331x, film.film_regional_release_date.film_release_region, Troyes
Nicolas Cochin, people.person.place_of_birth, Troyes
Hervé Schreiner, people.person.place_of_birth, Troyes
Nathalie Hervé, people.person.place_of_birth, Troyes
m.0wkvb_p, people.place_lived.location, Troyes
Adrien Moreau, people.person.place_of_birth, Troyes
Troyes, location.location.people_born_here, Nicolas Cochin
Troy weight, measurement_unit.measurement_system.weight_units, Troy ounce
Troyes, location.location.people_born_here, François Girardon
France, location.location.contains, Troyes
Miriam, people.deceased_person.place_of_death, Troyes
Troyes, location.location.people_born_here, Édouard Herriot
Troyes, location.location.people_born_here, Pierre Mignard
Patroclus of Troyes, people.person.place_of_birth, Troyes
Troyes, location.location.people_born_here, Miriam
Troyes, location.location.people_born_here, Yocheved
Troyes, location.location.people_born_here, Pierre Pithou
Troyes, location.location.people_born_here, Gaëtane Thiney
m.0hqtmwk, location.mailing_address.citytown, Troyes
troy pound.noun.01, base.wordnet.synset.equivalent_topic, Troy pound
Pierre Mignard, people.person.place_of_birth, Troyes
Troyes, location.location.people_born_here, Nicolas Siret
Troy pound, measurement_unit.mass_unit.measurement_system, Troy weight
Troyes, location.location.people_born_here, Thierry Laurey
Troyes, location.location.containedby, Champagne-Ardenne
Troyes, location.location.people_born_here, Nicolas Baudesson
Troyes, location.location.people_born_here, Damien Perquis
Theobald III, Count of Champagne, people.person.place_of_birth, Troyes
Ernest Neuhard, people.person.place_of_birth, Troyes
Troyes – Barberey Airport, aviation.airport.serves, Troyes
Troyes, location.location.people_born_here, Pauline Lefèvre
Hugues de Payens, people.person.place_of_birth, Troyes
Troy ounce, measurement_unit.mass_unit.weightmass_in_kilograms, 0.0311034768
Aube, location.location.contains, Troyes
Imperial unit system, measurement_unit.measurement_system.weight_units, Grain
Rashi, people.deceased_person.place_of_death, Troyes
Troyes, location.location.people_born_here, Adrien Moreau
Troyes, location.location.people_born_here, Stéphane Nater
Troyes, location.location.people_born_here, Mohamed Bradja
Troyes, location.location.people_born_here, Nicolas-Marie Songis des Courbons
Mass, measurement_unit.dimension.units, Troy ounce
troy.noun.01, base.wordnet.synset.hypernym, system of weights.noun.01
Troyes, location.location.people_born_here, Clotilde Hesme
Grain, measurement_unit.mass_unit.measurement_system, US customary units
Armand de Las Cuevas, people.person.place_of_birth, Troyes
Troyes, location.location.people_born_here, Régis Simon
Grain, measurement_unit.mass_unit.measurement_system, Imperial unit system
Troy weight, symbols.namesake.named_after, Troyes
m.0wk9x3k, people.place_lived.location, Troyes
European route E17, transportation.road.major_cities, Troyes
troy.noun.01, base.wordnet.synset.word, m.07r50hs
grain.noun.01, base.wordnet.synset.equivalent_topic, Grain
Troyes, location.location.people_born_here, Pierre de Larivey
Musée des beaux-arts de Troyes, location.location.containedby, Troyes
Troy weight, measurement_unit.measurement_system.weight_units, Troy pound
m.0whr77h, people.place_lived.location, Troyes
Troyes, location.location.people_born_here, Abdoul Sissoko
Jérôme Simon, people.person.place_of_birth, Troyes
Jacques Carrey, people.person.place_of_birth, Troyes
Troyes, location.location.people_born_here, Jacques Carrey
Guillaume Le Bé, people.person.place_of_birth, Troyes
m.03h8yvr, people.place_lived.location, Troyes
Troyes, location.location.people_born_here, Theobald I of Navarre
Troyes, location.location.people_born_here, François Simon
Troyes, location.location.people_born_here, Baptiste Martin
troy.noun.01, base.wordnet.synset.lexname, noun.quantity
Jacques de Létin, people.deceased_person.place_of_death, Troyes
Troyes, location.location.people_born_here, Michel Marot
Rachel, people.person.place_of_birth, Troyes
Mass, measurement_unit.dimension.units, Grain
m.0wkf2x4, people.place_lived.location, Troyes
Pennyweight, measurement_unit.mass_unit.measurement_system, Troy weight
Nicolas-Marie Songis des Courbons, people.person.place_of_birth, Troyes
m.0wh141x, people.place_lived.location, Troyes
Troyes, location.location.people_born_here, Djibril Sidibé
Troyes, location.location.people_born_here, Catherine Lemorton
Serkan Yanık, people.person.place_of_birth, Troyes
Nicolas Baudesson, people.person.place_of_birth, Troyes
m.0jvvljb, location.administrative_division_capital_relationship.capital, Troyes
troy.noun.01, base.wordnet.synset.equivalent_topic, Troy weight
Damien Perquis, people.person.place_of_birth, Troyes
pennyweight.noun.01, base.wordnet.synset.equivalent_topic, Pennyweight
Patrick Henry affair, people.person.place_of_birth, Troyes
Champagne-Ardenne, location.location.contains, Troyes
Lacoste, organization.organization.place_founded, Troyes
Troyes, location.location.people_born_here, Jacques de Létin
François Marque, people.person.place_of_birth, Troyes
Émile Coué, people.person.place_of_birth, Troyes
François Simon, people.person.place_of_birth, Troyes
Maurice Marinot, people.person.place_of_birth, Troyes
grain.noun.04, base.wordnet.synset.equivalent_topic, Grain
Troyes, location.location.people_born_here, g.120n33v2
Pope Urban IV, people.person.place_of_birth, Troyes
Stéphane Nater, people.person.place_of_birth, Troyes
Pauline Lefèvre, people.person.place_of_birth, Troyes
Troyes, location.statistical_region.population, g.11b7_j3s80
Nicolas Siret, people.person.place_of_birth, Troyes
Edmond Auger, people.person.place_of_birth, Troyes
Troyes, location.location.people_born_here, Nathalie Hervé
Troyes, location.location.containedby, France
Troyes, location.location.people_born_here, Élodie Hesme
Troyes, location.location.geolocation, m.0239r4v
Jaoid Chiguer, people.person.place_of_birth, Troyes
Pierre de Larivey, people.deceased_person.place_of_death, Troyes
Pierre de Larivey, people.person.place_of_birth, Troyes
Robert Galley, people.deceased_person.place_of_death, Troyes
Petrus Comestor, people.person.place_of_birth, Troyes
Troyes, location.location.contains, g.1229dsz_
Régis Simon, people.person.place_of_birth, Troyes
Troyes, location.location.contains, g.1q6f_rqjx
Jean Passerat, people.person.place_of_birth, Troyes
Troyes, location.location.people_born_here, Émile Coué
g.1q6f_rqjx, location.location.containedby, Troyes
Djibril Sidibé, people.person.place_of_birth, Troyes
Didier Bienaimé, people.person.place_of_birth, Troyes
Troyes, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0099-9a59
troy.noun.01, base.wordnet.synset.part_meronym, troy unit.noun.01
Alex Jeannin, people.person.place_of_birth, Troyes
Clotilde Hesme, people.person.place_of_birth, Troyes
Élodie Hesme, people.person.place_of_birth, Troyes
Troyes, location.location.people_born_here, Rachel
Lucien Pothier, people.deceased_person.place_of_death, Troyes
m.07r50hs, base.wordnet.word_sense.sense, troy.noun.01
Troyes, location.location.people_born_here, Henryk Kucharski
g.120n33v2, people.person.place_of_birth, Troyes
Pierre de Bérulle, people.person.place_of_birth, Troyes
Troyes, location.location.people_born_here, Jean Passerat
Louis Ulbach, people.person.place_of_birth, Troyes
Henryk Kucharski, people.person.place_of_birth, Troyes
troy.noun.01, base.wordnet.synset.word, m.07r50hc
noun.quantity, base.wordnet.lexical_name.synsets, troy.noun.01
grain.noun.05, base.wordnet.synset.equivalent_topic, Grain
Aube, location.fr_department.chef_lieu, Troyes
Troyes, location.location.people_born_here, Jean-Marie Bigard

Answer: Grain
Troy pound
Troy ounce
Pennyweight