"What's a compulsory question?" Qiaoqiao asked curiously.
"It's simple," Xu Huo pointed to two glasses of drinks, "You're really thirsty now, but one glass is poisoned, and you don't know which one. How would you choose?"
Qiaoqiao didn't understand his point, "If I already know it's poisoned, why would I choose at all? Just don't drink it."
"What if the drinks were replaced with mission tasks? High risk events you need to complete, to pass, would you do it or not?" Xu Huo asked again.
This sounds very lifelike, Qiaoqiao rubbed his chin and thought for a moment, "That depends on if I can bear the risks. If it risks my life, I definitely wouldn't want to do it. It's better to not complete the mission."
"Compulsory questions require you to choose one from the options, you can't skip the question itself." Xu Huo said.
