Explanation:

- P. Upendra was not the first Speaker of Lok Sabha. He served as the Speaker much later.

- Hukam Singh was the third Speaker of Lok Sabha, not the first.

- Anantha Sayanam Ayyangar was actually the first Deputy Speaker, and later became Speaker, but was not the first Speaker.

- Ganesh Vasudev Mavalankar (often written as G.V. Mavalankar or Malvankar) ?? was the first Speaker of the Lok Sabha (1952-1956) after India became a republic.