Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) An American researcher has been sentenced to 10 years in prison after being convicted of spying, according to Iran. Princeton University identified the man as Chinese-born Xiyue Wang, an American citizen and graduate student in history. Wang was arrested in Iran last summer while doing scholarly research in connection with his Ph.D. dissertation, a university statement said. Earlier Sunday, the semi-official news agency Fars News, citing a video statement from Iranian judicial spokesman Gholamhossein Mohseni-Ejheie, initially identified the convicted man's nationality as Iranian-American. Later, Fars News, again citing Mohseni-Ejheie, said he was a citizen of the United States and a country other than Iran.Princeton identifies man as Chinese-born Xiyue Wang, an American citizen and graduate student in historyHe was arrested and put on trial for "gathering information," Iranian news service says 
 Question:According to _ law, a convicted person has 20 days to appeal a sentence.

Iran