You will be given a context, a subject and a relation. Your task is to generate a question based on the subject and relation. The generated question should include the given subject. Try to use a minimum number of words that are not present in either context, subject or relation while generating question.

Context : JTBC constructs a new building in Digital Media City in Sangam-dong, Seoul. 
Subject : JTBC 
Relation : parent company
Which company is the parent company of JTBC?

Context : The Logical Language Group (LLG) began developing Lojban in 1987. 
Subject : Lojban 
Relation : based on
Which is the basis of Lojban?

Context : Porthos, Baron du Vallon de Bracieux de Pierrefonds is a fictional character in the novels The Three Musketeers, Twenty Years After and The Vicomte de Bragelonne by Alexandre Dumas, père. 
Subject : Porthos 
Relation : based on

The Porthos is based upon what?