बच्चों को समय-समय पर दी जाने वाली विटामिन A की खुराक मुख्य रूप से उन्हें आँख की किस स्थिति से बचाती है?

The Dandi March, also known as the Salt Satyagraha, was led by which influential leader?

Which act formally granted independence to India, marking the end of British rule?

Who was the key figure in establishing the Indian National Congress?