If a person cannot answer the questions of Munkar and Nakir, and he is a monotheist, will he be brought out of the Fire?

Question:
If a person cannot answer the questions of Munkar and Nakir, and he is a monotheist but a sinner, will he be brought out of the Fire as the Prophet (peace and blessings be upon him) said:

Answer:
The believer answers, even if he is a sinner. The believer in Allah and His Messenger answers with the correct answer, even if he is a sinner. He may be punished in his grave according to the measure of his sins, and this is a purification for him; he is punished according to his sins, and then the punishment is stopped. It is not reported that he is punished for talebearing or for not guarding himself from his urine; these are sins for which the believer is punished in his grave. But this does not mean that he is like the hypocrite who says, "Ha, ha, I do not know." Yes.