Take the following as truth: The sinister prison of the Conciergerie ' named after the royally appointed concierge in charge of common-law criminals ' welcomed Marie-Antoinette, Robespierre, Madame du Barry, Danton, and 2,500 others into its antechamber of the guillotine. 
Then the following statement: "Robespierre was a French politician who was executed during the French Revolution." is true, false, or inconclusive?
Answer: Inconclusive