Question: Who presides over the joint sitting of the two houses of parliament?
Disambiguated questions and answers: question: Who primarily presides over the joint sitting of the two houses of parliament?
Who presides over the joint sitting of the two houses of parliament if the speaker is absent?
Who presides over the joint sitting of the two houses of parliament if the speaker and deputy speaker are absent?
answer: Speaker of the Lok Sabha
Deputy Speaker of the Lok Sabha
Deputy-Chairman of the Rajya Sabha
Natural Questions answer: Speaker of the Lok Sabha (from the Wikipedia article "Joint Session of Indian Parliament")