प्रायोगिक अनुसंधान (experimental research) में, वह समूह जिसे उपचार या हस्तक्षेप प्राप्त नहीं होता है, कहलाता 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?