New Delhi, Sept. 26 -- A Rs.25 lakh question on Kaun Banega Crorepati 18 left Noida-based contestant Prashant Kumar Sinha uncertain enough to walk away from the game, even though he later realised he had identified the correct answer.

Prashant, 35, had successfully answered questions worth up to Rs.12.5 lakh on the Amitabh Bachchan-hosted quiz show. But when the Rs.25 lakh question appeared, he chose not to risk the money he had already secured.

The question asked, "Which geographical feature marks the lowest elevation on Earth's land surface?"

The options were the shore of Lake Baikal, the Sahara Desert, the shore of the Dead Sea and Death Valley. Prashant was unable to confidently settle on one option and decided to quit the game wit...