निम्नलिखित विकल्पों में से कौन सा आयोडीन का प्राकृतिक रूप से समृद्ध स्रोत 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?