Evolution of Techniques for Question Answering over Knowledge Base: A Survey

In this paper, a brief study of the advancements in the Question Answering domain as a type of information retrieval system is presented. Question Answering systems are responsible to provide answers to the questions proposed over a knowledge base in natural language to retrieve the required information. The promising results achieved in Question Answering in Natural Language Processing are discussed. The aim is to cover a concise yet complete understanding of the advances in Question Answering Systems classified based on domain and question type and brief information about metrics used to evaluate the system.