Question: The Ionian school produced which scholar who was a pre-Socratic Greek philosopher who lived in Miletus?

Context paragraphs:
Heraclitus: Heraclitus of Ephesus ( ; Greek: Ἡράκλειτος ὁ Ἐφέσιος , "Hērákleitos ho Ephésios" ; c. 535 – c. 475 BC) was a pre-Socratic Greek philosopher, and a native of the city of Ephesus, then part of the Persian Empire.  He was of distinguished parentage.  Little is known about his early life and education, but he regarded himself as self-taught and a pioneer of wisdom.  From the lonely life he led, and still more from the apparently riddled and allegedly paradoxical nature of his philosophy and his stress upon the needless unconsciousness of humankind, he was called "The Obscure" and the "Weeping Philosopher".

Protagoras: Protagoras ( ; Greek: Πρωταγόρας ; c. 490 – c. 420 BC) was a pre-Socratic Greek philosopher and is numbered as one of the sophists by Plato.  In his dialogue, "Protagoras", Plato credits him with having invented the role of the professional sophist.

Ionian Enlightenment: The Ionian Intellectual Revolution was a set of advances in scientific thought, explanations on nature, and discovering the natural and rational causes behind observable phenomena, that took place in archaic Greece beginning in the 6th century BC.  This movement began on the Ionian coast of western Anatolia by small numbers of forward-thinking Greeks (see Ionian School and Milesian School) from cities such as Miletus, Samos, and Halicarnassus.

Ionian School (philosophy): The Ionian school, a type of Greek philosophy centred in Miletus, Ionia, in the 6th and 5th centuries BCE, is something of a misnomer.  Although Ionia was a center of Western philosophy, the scholars it produced, including Thales, Anaximander, Anaximenes, Heraclitus, Anaxagoras, Archelaus, and Diogenes of Apollonia, had such diverse viewpoints that they cannot all be thought of as having belonged to one particular school of philosophy.  Aristotle called them "physiologoi", meaning 'those who discoursed on nature', but did not group them together as an "Ionian school".  The classification can be traced to the second-century historian of philosophy Sotion.  They are sometimes referred to as cosmologists, since they were largely physicalists who tried to explain the nature of matter.

Anaxagoras: Anaxagoras ( ; Greek: Ἀναξαγόρας , "Anaxagoras", "lord of the assembly";  510 – c. 428  BC) was a Pre-Socratic Greek philosopher.  Born in Clazomenae in the Persian Empire (modern-day Urla, Turkey) Anaxagoras was the first to bring philosophy to Athens.  According to Diogenes Laertius and Plutarch, in later life he was charged with impiety and went into exile in Lampsacus; the charges may have been political, owing to his association with Pericles, if they were not fabricated by later ancient biographers.

Anaximander: Anaximander ( ; Greek: Ἀναξίμανδρος "Anaximandros"; was a pre-Socratic Greek philosopher who lived in Miletus, a city of Ionia (in modern-day Turkey).  He belonged to the Milesian school and learned the teachings of his master Thales.  He succeeded Thales and became the second master of that school where he counted Anaximenes and, arguably, Pythagoras amongst his pupils.

Hippo (philosopher): Hippo ( ; Greek: Ἵππων , "Hippon"; fl.  5th century BC) was a Pre-Socratic Greek philosopher.  He is variously described as coming from Rhegium, Metapontum, Samos, and Croton, and it is possible that there was more than one philosopher with this name.

Counter-Earth: The Counter-Earth is a hypothesized by the pre-Socratic Greek philosopher Philolaus (c. 470 – c. 385 BC) to support his non-geocentric cosmology, in which all objects in the universe revolve around an unseen "Central Fire" (distinct from the Sun which also revolves around it).  The Greek word Antichthon (Greek: Ἀντίχθων ) means "Counter-Earth".

Parmenides: Parmenides of Elea ( ; Greek: Παρμενίδης ὁ Ἐλεάτης ; fl.  late sixth or early fifth century BC) was a pre-Socratic Greek philosopher from Elea in Magna Graecia (Greater Greece, included Southern Italy).  He was the founder of the Eleatic school of philosophy.  The single known work of Parmenides is a poem, "On Nature", which has survived only in fragmentary form.  In this poem, Parmenides describes two views of reality.  In "the way of truth" (a part of the poem), he explains how reality (coined as "what-is") is one, change is impossible, and existence is timeless, uniform, necessary, and unchanging.  In "the way of opinion", he explains the world of appearances, in which one's sensory faculties lead to conceptions which are false and deceitful.

Zeno of Elea: Zeno of Elea ( ; Greek: Ζήνων ὁ Ἐλεάτης ; c. 490 – c. 430 BC) was a pre-Socratic Greek philosopher of Magna Graecia and a member of the Eleatic School founded by Parmenides.  Aristotle called him the inventor of the dialectic.  He is best known for his paradoxes, which Bertrand Russell has described as "immeasurably subtle and profound."

Supporting paragraphs: Ionian School (philosophy) Anaximander
Answer: Anaximander