Which team is known as 'Los Colchoneros', meaning 'The Mattress Makers', a nickname originating from their red-and-white striped shirts resembling traditional mattresses?

• A Atletico Madrid ✓
• B Athletic Club
• C Real Betis
• D Real Sociedad

Atletico Madrid's distinctive red and white vertical stripes earned them the colchoneros nickname, a reference to old Spanish mattress ticking fabric.