The correct answer is conflict.
An irritant is something that causes mild annoyance or discomfort. A pain is a physical or emotional suffering. A culprit is a person who is guilty of a crime or wrongdoing.
The Election Commission and the Union Government have had several conflicts over the years, particularly regarding the powers of the Election Commission in respect of the deployment of central police forces at places where elections are held. The Election Commission has argued that it has the sole authority to decide on the deployment of central police forces, while the Union Government has argued that it has the right to deploy central police forces in order to maintain law and order. This conflict has led to several court cases, and the Supreme Court has ruled in favor of the Election Commission on several occasions.
The conflict between the Election Commission and the Union Government is a major issue, as it has the potential to undermine the integrity of the electoral process. It is important for both sides to work together to resolve this conflict in order to ensure that elections are conducted in a free and fair manner.