किसी अवधारणा को पढ़ाते समय, एक शिक्षक ऐसा उदाहरण दे रहा है जिसमें उस अवधारणा से जुड़ी श्रेणी की सबसे महत्वपूर्ण 'मुख्य' विशेषताएं हैं। ऐसे उदाहरण को क्या कहा 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?