खाद्य किण्वन (fermentation) के दौरान निम्नलिखित में से कौन सा पोषक तत्व (विटामिन) संश्लेषित या महत्वपूर्ण रूप से बढ़ जाता 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?