I want to know the answer to the following question:
Where is the teaching of Catalan mandatory?
All the background I'm provided with is that "The teaching of Catalan is mandatory in all schools, but it is possible to use Spanish for studying in the public education system of Catalonia in two situations, if the teacher assigned to a class chooses to use Spanish, or during the learning process of one or some recently arrived students.". Is that enough to answer the question?
Answer: yes