Answer: The correct answer is : The fault to Madame Podtotchina.
Explanation: Podtochina is the wife of the personnel officer. Ivan finds his nose when he cut the roll. Kovaloff thinks that the nose was stronger than him and he feels jealous, he lets see his paranoia when he thinks someone picked up his nose, he knows that it is his nose because he has the same grain that had appeared before losing it.
