Explanation

The pillars of Islam are Shahada (declaration of faith), Salat (Namaz/prayer), Zakat (charity), Sawm (fasting), and Hajj (pilgrimage). Therefore, Namaz is one of the core pillars. Zakat is a pillar but not the third listed in the standard sequence; Touheed is the first pillar (Shahada) and Fasting is another pillar. The question likely refers to the five main pillars, making Namaz a strong candidate for the 'third' if listing order varies, or it might be flawed as the list usually starts with Shahada.