भारतीय रेलवे के पूर्व रेलवे क्षेत्र (जोन) का मुख्यालय कहाँ स्थित है?

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?