Okay kiddo, so "who" means a person or a group of people that we are talking about. For example, if I say "who ate all the cookies?", I am asking which person is responsible for eating all the cookies.
Now, when we talk about a "ministry", we are talking about a department or group of people who work together in the government to take care of a specific area of responsibility. For example, the Ministry of Health takes care of making sure that people stay healthy and that they have access to good healthcare.
So when we say "who? who? ministry", we are asking which person or people from a particular ministry are responsible for something we are trying to figure out. It's like trying to solve a mystery by finding out who did something within a specific group of people who are in charge of that thing.