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: the meson family includes what subatomic particles? 
Knowledge Triplets: m.0b43fpt, physics.particle_antiparticle.particle, Upsilon meson
π⁻, physics.particle.family, Meson
Upsilon meson, physics.particle.spin, 1.0
Meson, physics.particle.family, Upsilon meson
Pion, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-14ed
π⁰, physics.particle.family, Meson
π⁻, physics.hadron.composition, m.093bvmg
Upsilon meson, physics.hadron.composition, m.0955x_1
Meson, physics.particle_family.particles, π⁺
m.0t8cspz, dataworld.gardening_hint.last_referenced_by, Meson
Meson, physics.particle.family, Pion
m.093vy0t, physics.subatomic_particle_composition.composes, J/psi meson
m.063x6dy, award.award_honor.year, 1949
Meson, physics.particle_family.parent_class, Hadron
π⁺, physics.particle.spin, 0.0
Meson, physics.particle_family.particles, Pion
m.0955x_1, physics.subatomic_particle_composition.composes, Upsilon meson
m.010qr_8w, dataworld.gardening_hint.last_referenced_by, Upsilon meson
Pion, base.schemastaging.context_name.pronunciation, g.125_pctml
π⁻, physics.particle.electric_charge, -1.0
Baryon, physics.particle_family.parent_class, Hadron
Hadron, base.ontologies.ontology_instance.equivalent_instances, m.07nf4_j
J/psi meson, physics.particle.antiparticle, m.0b43fn5
m.093bryw, physics.subatomic_particle_composition.composes, π⁺
m.093vy11, physics.subatomic_particle_composition.composes, J/psi meson
J/psi meson, physics.hadron.composition, m.093vy11
m.093bvm2, physics.subatomic_particle_composition.composes, π⁻
J/psi meson, base.nobelprizes.nobel_subject_area.nobel_awards, m.063qylk
Hadron, physics.particle_family.subclasses, Meson
Upsilon meson, physics.particle.family, Meson
π⁺, physics.particle.antiparticle, m.093bpww
Meson, physics.particle.family, J/psi meson
m.07nf4_j, base.ontologies.ontology_instance_mapping.freebase_topic, Hadron
m.063x6dy, base.nobelprizes.nobel_honor.nobel_prize_winner, Hideki Yukawa
π⁰, physics.particle.electric_charge, 0.0
m.093bryh, physics.subatomic_particle_composition.composes, π⁺
m.019h, type.permission.controls, m.0t8cspz
J/psi meson, physics.particle.electric_charge, 0.0
m.063x6dy, award.award_honor.notes_description, "for his prediction of the existence of mesons on the basis of theoretical work on nuclear forces"
Hideki Yukawa, base.nobelprizes.nobel_prize_winner.nobel_honor, m.063x6dy
Hadron, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0099-9227
Meson, physics.particle_family.particles, J/psi meson
Meson, physics.particle_family.particles, π⁰
J/psi meson, physics.particle.family, Meson
m.0t8cspz, type.object.permission, m.019h
m.093bvmg, physics.subatomic_particle_composition.composes, π⁻
π⁻, physics.hadron.composition, m.093bvm2
m.0qv6bpj, dataworld.gardening_hint.last_referenced_by, Hadron
m.063r04g, base.nobelprizes.nobel_honor.subject_area, Pion
π⁺, physics.particle.family, Meson
B meson, physics.particle.family, Meson
J/psi meson, physics.hadron.composition, m.093vy0t
Hadron, physics.particle_family.subclasses, Baryon
π⁻, physics.particle.antiparticle, m.093bpww
m.0955x_8, physics.subatomic_particle_composition.composes, Upsilon meson
Upsilon meson, physics.hadron.composition, m.0955x_8
Meson, physics.particle_family.particles, Upsilon meson
m.0b43fn5, physics.particle_antiparticle.particle, J/psi meson
Pion, base.nobelprizes.nobel_subject_area.nobel_awards, m.063r04g
m.0sbn1cx, dataworld.gardening_hint.last_referenced_by, B meson
Meson, physics.particle_family.particles, π⁻
b-meson.noun.01, base.wordnet.synset.equivalent_topic, B meson
J/psi meson, physics.particle.spin, 1.0
Meson, base.nobelprizes.nobel_subject_area.nobel_awards, m.063x6dy
m.0b43fmz, physics.particle_antiparticle.particle, π⁰
π⁰, physics.particle.spin, 0.0
Upsilon meson, physics.particle.electric_charge, 0.0
m.093bpww, physics.particle_antiparticle.particle, π⁻
Meson, physics.particle.family, π⁻
Meson, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0099-a77a
m.0ndkgrp, dataworld.gardening_hint.last_referenced_by, J/psi meson
Pion, physics.particle.family, Meson
π⁺, physics.hadron.composition, m.093bryh
m.063x6dy, base.nobelprizes.nobel_honor.subject_area, Meson
Meson, physics.particle_family.particles, B meson
π⁰, physics.particle.antiparticle, m.0b43fmz
π⁺, physics.particle.electric_charge, 1.0
m.063qylk, base.nobelprizes.nobel_honor.subject_area, J/psi meson
π⁻, physics.particle.spin, 0.0
m.093bpww, physics.particle_antiparticle.particle, π⁺
π⁺, physics.hadron.composition, m.093bryw
Upsilon meson, physics.particle.antiparticle, m.0b43fpt
Meson, physics.particle.family, π⁰

Answer: Upsilon meson
π⁺
π⁰
π⁻
B meson
J/psi meson
Pion