Yaksha Prashna is an important part of mahabharatha where Lord of Death questions pandavas before they are allowed to drink water from a pond .Who successfully answers all his questions to Dharma dev's satisfaction ?

In the Yaksha Prashna episode of Mahabharata, Yudhistra (Yudhishthira) alone answered all questions posed by Yaksha, a manifestation of Yama (Dharma). His brothers - Bhima, Arjuna, Nakula, and Sahadeva - failed to answer and fell dead drinking from the enchanted pond. Yudhistra's wisdom and adherence to dharma saved them.