Question: Rashtriya Swayamsevak Sangh, abbreviated as RSS, is an Indian right-wing, Hindu nationalist, paramilitary volunteer organisation that is widely regarded as the parent organisation of which ruling party of India, and is one of the two major political parties in India, along with the Indian National Congress?
Sentence (from "Bharatiya Janata Party"): s of 2016 , it is the country's largest political party in terms of representation in the national parliament and state assemblies, and it is the world's largest party in terms of primary membership.
Relevant evidence: No