Definition: In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it. Your job is to determine which sentence(s) from the passage can be used to search for further information needed to answer the question.
Input: Question: Who did Nikolay Novosiltsev work for? Passage:In 1817, while still a student, Mickiewicz, Tomasz Zan and other friends had created a secret organization, the Philomaths. The group focused on self-education but had ties to a more radical, clearly pro-Polish-independence student group, the Filaret Association. An investigation of secret student organizations by Nikolay Novosiltsev, begun in early 1823, led to the arrests of a number of students and ex-student activists including Mickiewicz, who was taken into custody and imprisoned at Vilnius' Basilian monastery in late 1823 or early 1824 (sources disagree as to the date). After investigation into his political activities, specifically his membership in the Philomaths, in 1824 Mickiewicz was banished to central Russia. Within a few hours of receiving the decree on 22 October 1824, he penned a poem into an album belonging to Salomea Bécu, the mother of Juliusz Słowacki. (In 1975 this poem was set to music in Polish and Russian by Soviet composer David Tukhmanov.) Mickiewicz crossed the border into Russia about 11 November 1824, arriving in Saint Petersburg later that month. He would spend most of the next five years in Saint Petersburg and Moscow, except for a notable 1824 to 1825 excursion to Odessa, then on to Crimea. That visit, from February to November 1825, inspired a notable collection of sonnets (some love sonnets, and a series known as Crimean Sonnets, published a year later).

Output:
An investigation of secret student organizations by Nikolay Novosiltsev, begun in early 1823, led to the arrests of a number of students and ex-student activists including Mickiewicz, who was taken into custody and imprisoned at Vilnius' Basilian monastery in late 1823 or early 1824 (sources disagree as to the date)