एस. सी. दुबे ने अपनी किस पुस्तक में लिखा है कि 'यह याद रखना आवश्यक है कि भारतीय जनसंख्या का एक बड़ा हिस्सा अलग-अलग स्तरों पर नस्लीय मिश्रण का प्रतिनिधित्व करता 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?