Task: Question Generation
Input (English): Passage: The representatives of the Provisional Russian Administration in Principality of Bulgaria, who sympathised with the struggle, were reprimanded by the Russian Emperor in person. These were the decisive reasons for Its failure, parallel with reasons of internal and organizational character. Typical for the uprising was the scale participation of volunteers - Bulgarians of all parts of the country. Some figures as an illustration: 100 volunteers from Sofia, 27 from Tirnovo, 65 from Pazardzhik, 19 from Troyan, 31 from Pleven, 74 from Orhanye, 129 from the Plovdiv district, 17 from Provadia, 30 from Eastern Rumelia and others. A large number of insurgents and leaders of different parts of Macedonia also participated in the uprising. After the Upspring some 30,000 refugees fled to Bulgaria. The failure of the uprising lead to the attention of the Bulgarian political and strategic leaders to liberation of the other parts of the Bulgarian territories and to other main strategic objective - unification of the Principality of Bulgaria and Eastern Roumelia, the later being under Sultans power, but still having a large autonomy. Macedonia and Thrace should have to wait.
Output (English): Which region of Bulgaria sent the most volunteers?