In the year 1952, who among the following lent his voice for the film ‘Amar…

Concept — Early Indian studios often carried one production into a second language: the same director, the same score and largely the same cast, with the songs re-recorded to fresh lyrics in the second language. Because the melody and orchestration are retained while the vocals are cut anew, each language version carries its own playback credits. Identifying the singer behind such a release therefore means asking whose name is attached to the specific language version in question, not merely who was famous at the time.

Applying it here — ‘Amar Bhupali’ was V. Shantaram's Rajkamal Kalamandir film on the Marathi shahir-poet Honaji Bala, scored by Vasant Desai. Its Marathi soundtrack, usually dated 1951, credits Panditrao Nagarkar along with Lata Mangeshkar and Asha Bhosle. The Bengali release of 4 April 1952 carries freshly recorded Bengali vocals, and there the male playback was taken by Manna Dey in place of Nagarkar. The singer the question points to is therefore Manna Dey, which is also the answer recorded in the exam's official key.

Cross-check against the other singers —

• Kishore Kumar was in these years building a career as a Hindi playback singer and screen actor, and does not appear in this film's credits.

• Hemanta Mukherjee (Hemant Kumar) sang and composed extensively for Bengali and Hindi cinema, but is not among this production's playback credits.

• Debabrata Biswas is remembered as a concert and gramophone interpreter of Rabindra Sangeet rather than as a studio playback singer.

A note on the wording — Archival records attach Manna Dey's credit to the Bengali version of 4 April 1952 rather than to the 1951 Marathi soundtrack; the question's phrasing about two simultaneous languages follows the examining body's own framing of a single two-language project, and Manna Dey is the only one of the four singers connected to it.