मानसिक स्वास्थ्य सेवा अधिनियम, 2017 भारत में निम्नलिखित में से किस तिथि को लागू हुआ था?

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?