The Tenth Question: All or Nothing!

is episode 25 of the original Naruto anime.

Synopsis
The camera moves around and comes to class where the Genin are writing the exam. Ibiki Morino says that incompetent ones have already dropped, so he, after 45 minutes, can give the final, tenth question. But he says that there is one special rule for this question. Meanwhile, the scene moves to the place where Kakashi Hatake, Asuma Sarutobi and Kurenai Yuhi are. Kakashi and Asuma explain to Kurenai that Ibiki is a great ninja, specialized for torture and interrogation.

Back in class, Ibiki says that they can choose whether or not they want to try and solve the tenth question. If they don't want to, the entire team will fail, but if they choose to answer the question but don't know the answer, they will be barred from taking the Chūnin Exams forever. Many of them choose not to answer the question and they leave the class. Naruto, in his loud style says: "I'm not scared! I will take this exam!" calming everyone down. After that, Ibiki says that all who remain in the classroom (78 students) pass. He then explains that the meaning of first nine questions were to test their information gathering skills.

As for the tenth question, that was put in to test their determination and bravery. He then compares it to a hypothetical ninja mission. "Let me give you a hypothetical mission: to steal a document from an enemy stronghold. You have no idea how many ninja the enemy has, or how heavily armed they are. Furthermore, you have reason to believe that the enemy expects you, that you might very well be walking blindly into a trap. Now, do you have the option of taking a pass on this insane mission, of saying my comrades and I would live to fight another day? Can you choose to avoid danger? No! There will be many missions that will seem almost suicidal if you think about it, but you do not think about it! You think only of the goal and of achieving it through courage and discipline. These are the qualities required of a chunin squad leader.

"Those who choose the safer of two paths, those whose determination falters in the face of adversity, those who would put there comrades' lives in jeopardy by worrying about their own, those who would save there own necks at the price of sacred honor will never be able to call themselves chunin, at least as long as I'm here."

After that, through the window crashes the second examiner, Anko Mitarashi. At the end of episode, Ibiki picks up Naruto's exam and smiles, because this was the first time he saw a student pass with an empty exam sheet.