भारत रत्न उस्ताद बिस्मिल्ला खाँ का मुख्य संबंध किस जिले से है, जहाँ उन्होंने अपना संगीत जीवन बिताया?

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?