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 subatomic particle is in the same family as the charm antiquark? 
Knowledge Triplets: Quark, physics.particle_family.particles, Bottom antiquark
Quark, physics.particle.family, Up antiquark
Muon, physics.particle.generation, Second generation
Down quark, physics.particle.family, Quark
antiquark.noun.01, base.wordnet.synset.broader_topic, Quark
Up antiquark, physics.particle.family, Quark
Top antiquark, physics.particle.family, Quark
Charm antiquark, physics.particle.antiparticle, m.094dfm8
Strange quark, physics.particle.generation, Second generation
m.093vy11, physics.subatomic_particle_composition.number, 1
Charm quark, physics.particle.family, Quark
Charm quark, physics.particle.generation, Second generation
Quark, physics.particle_family.particles, Bottom quark
Quark, physics.particle_family.particles, Down quark
Second generation, physics.subatomic_particle_generation.particles, Strange quark
Quark, physics.particle_family.particles, Up quark
m.093vy11, physics.subatomic_particle_composition.particle, Charm antiquark
Quark, physics.particle.family, Up quark
quark.noun.01, base.wordnet.synset.equivalent_topic, Quark
Fermion, physics.particle_family.subclasses, Quark
Quark, physics.particle_family.particles, Top antiquark
Charm antiquark, physics.particle.family, Quark
Quark, physics.particle_family.particles, Up antiquark
Quark, physics.particle_family.particles, Strange antiquark
Second generation, physics.subatomic_particle_generation.particles, Antimuon
Quark, physics.particle_family.particles, Charm antiquark
Up quark, physics.particle.family, Quark
Second generation, physics.particle.generation, Strange quark
Second generation, physics.subatomic_particle_generation.particles, Charm quark
Quark, base.ontologies.ontology_instance.equivalent_instances, m.09klhvj
Quark, physics.particle_family.particles, Strange quark
quark tv-show, community.discussion_thread.topic, Quark
Charm antiquark, physics.quark.composes, m.093vy11
Quark, physics.particle.family, Bottom quark
Quark, physics.particle.family, Top quark
Strange antiquark, physics.particle.generation, Second generation
Second generation, physics.particle.generation, Charm quark
Down antiquark, physics.particle.family, Quark
Charm antiquark, physics.subatomic_particle_generation.particles, Second generation
m.094dfm8, physics.particle_antiparticle.particle, Charm quark
Charm antiquark, physics.particle.spin, 0.5
Quark, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-3ef7
Bottom antiquark, physics.particle.family, Quark
Charm antiquark, physics.particle.generation, Second generation
m.094dfm8, physics.particle_antiparticle.self_antiparticle, false
Charm quark, physics.particle.antiparticle, m.094dfm8
Quark, physics.particle_family.particles, Down antiquark
m.094dfm8, physics.particle_antiparticle.particle, Charm antiquark
J/psi meson, physics.hadron.composition, m.093vy11
Antimuon, physics.particle.generation, Second generation
Quark, physics.particle_family.particles, Top quark
Charm antiquark, physics.particle.electric_charge, -0.666666666667
Second generation, physics.subatomic_particle_generation.particles, Muon
Quark, physics.particle_family.particles, Charm quark
Second generation, physics.subatomic_particle_generation.particles, Charm antiquark
Second generation, physics.particle.generation, Strange antiquark
Top quark, physics.particle.family, Quark
Bottom quark, physics.particle.family, Quark
m.093vy11, physics.subatomic_particle_composition.composes, J/psi meson
Second generation, physics.subatomic_particle_generation.particles, Strange antiquark
Strange quark, physics.particle.family, Quark
m.09klhvj, base.ontologies.ontology_instance_mapping.freebase_topic, Quark
Quark, physics.particle_family.parent_class, Fermion
Strange antiquark, physics.particle.family, Quark

Answer: Down quark
Charm quark
Top quark
Bottom quark
Down antiquark
Strange antiquark
Top antiquark
Bottom antiquark
Strange quark
Up quark
Up antiquark