Task: Question Answering
Input (English): Sentence: In order to seek out the Karmapa, the Yongle Emperor dispatched his eunuch Hou Xian and the Buddhist monk Zhi Guang (d. 1435) to Tibet. Traveling to Lhasa either through Qinghai or via the Silk Road to Khotan, Hou Xian and Zhi Guang did not return to Nanjing until 1407. 
Question: Where did Hou Xian and Zhi Guang travel through on their way to the Karmapa?
Output (English): through Qinghai or via the Silk Road to Khotan