On va a la _ pour apprendre.

The sentence On va a la ___ pour apprendre means "One goes to the ___ to learn." The key phrase is pour apprendre (to learn/in order to learn), which identifies the purpose of going to this place.

The correct answer is ecole (school). A school is the institution specifically designed for learning and education. On va a l'ecole pour apprendre - One goes to school to learn.

The other places serve different primary purposes:

• pharmacie (pharmacy) is where one goes to buy medicine
• banque (bank) is where one goes to manage money
• mairie (town hall/city hall) is where one goes for administrative and civic services

This type of question tests the ability to match places with their functions, a core vocabulary skill in French.