निम्नलिखित में से कौन सी सिगमंड फ्रायड द्वारा खोजी गई प्रमुख मनोविश्लेषणात्मक अवधारणाओं में से एक नहीं 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?