Only Indian Prime Minister to have never attended Parliament while in office

Question = Who is the only Indian Prime Minister to have never attended Parliament while in office ?

Answer = Chaudhary Charan Singh - The Lok Sabha never met during his tenure of less than 6 months was the Prime Minister of the Republic of India, serving from 28 July 1979 until 14 January 1980. Chaudhary Charan Singh's government did not face the Lok Sabha during his brief tenure as the Indian National Congress withdrew their support from his Government as he refused to agree to the terms of the Congress to protect Indira Gandhi and her associates from prosecution under the laws of the land. Charan Singh resigned^[5] and fresh elections were held six months later.