In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.

The Medellín Cartel was a ruthless, highly organized and much-feared Colombian drug cartel originating in the city of Medellín, Colombia. The drug cartel operated throughout the 1970s and 1980s in Bolivia, Colombia, Central America, Peru, and the United States, as well as in Canada and Europe. It was founded and run by Ochoa Vázquez brothers Jorge Luis, Juan David, and Fabio, together with Pablo Escobar, George Jung, Ishaq Velasco, Carlos Lehder and José Gonzalo Rodríguez Gacha. By 1993, the resistance group, Los Pepes (or PEPES), controlled by the Cali Cartel, and the Colombian government, in collaboration with the Cali Cartel, right-wing paramilitary groups, and the United States government, had dismantled the Medellín Cartel by imprisoning or assassinating its members.
who was the head of the medellin cartel