original question: Find Spanish comarca whose capital is [Terrassa].
answer: vall√®s occidental
answer type: Spanish comarca.
auxiliary information: Terrassa is a Spanish city in the east central region of Catalonia, in the province of Barcelona, comarca of Vall√®s Occidental, of which it is the cocapital along with Sabadell. The city is located in the Catalan Prelitoral depression, at the feet of the Prelitoral mountain range and the average altitude of the city is 277 meters above sea level. It is 20 and 18 kilometres from Barcelona and Montserrat respectively.
[Terrassa] is the capital of what Spanish comarca city?