पुरुष सूक्त, जिसमें चारों वर्णों का सबसे पहला लिखित संदर्भ मिलता है, किस वैदिक ग्रंथ का भाग 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?