छोटे बच्चों को प्रभावित करने वाली एक प्रमुख पोषण संबंधी समस्या, जो स्थायी अंधेपन का कारण बन सकती है, निम्नलिखित में से किसकी कमी 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?