Who among the following was the first pro-tem Speaker to be unanimousl

Who among the following was the first pro-tem Speaker to be unanimously elected as the Speaker of the Lok Sabha ?

Rabi Ray
Hiren Mukherjee
Somnath Chatterjee
P.A. Sangma
This question was previously asked in
UPSC CAPF – 2023
P.A. Sangma holds the distinction of being the first pro-tem Speaker to be unanimously elected as the Speaker of the Lok Sabha. He was appointed pro-tem Speaker in 1996 and subsequently elected as the Speaker of the 11th Lok Sabha on May 25, 1996.
The pro-tem Speaker’s role is temporary, usually limited to administering the oath to new members and presiding over the election of the Speaker. A pro-tem Speaker can be elected as the regular Speaker. P.A. Sangma’s unanimous election was a notable event.
Rabi Ray was elected Speaker in 1989. Somnath Chatterjee was elected Speaker in 2004. Neither served as pro-tem Speaker immediately prior to their election as Speaker. Hiren Mukherjee was a prominent parliamentarian but did not serve as Speaker.