Definition: In this task you are given a list of triplets of the form [subject, predicate, object] and the output should be a question based on the triplets but with the subject and/or object replaced with blanks (represented using two or more consecutive underscores). Triplet values encompassed in [*] are special tokens that can be replaced with synonyms. The objective is to construct a question in a manner that (a) captures the facts specified in at least one of the triplets, and (b) ideally contains a limited number of blanks such that it is a well-formed question that is easy to answer. A blank can represent a single word or a phrase.
Input: [['Bacon Explosion', 'COUNTRY', 'United States'], ['United States', 'LEADER_NAME', 'Paul Ryan'], ['United States', 'ETHNIC_GROUP', 'African Americans'], ['United States', 'CAPITAL', 'Washington, D.C.']]

The leader of the United States is Paul Ryan and the capital city is Washington DC. The country is the origin of the _____ and contains the ethnic group of African Americans.