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Option 1: Dr. S. P. Mukherjee was not responsible for mass religious conversion in the first cabinet of independent India.
Option 2: Dr. John Mathai was not responsible for mass religious conversion in the first cabinet of independent India.
Option 3: Sardar Baldev Singh was not responsible for mass religious conversion in the first cabinet of independent India.
Option 4: Dr. B. R. Ambedkar was responsible for mass religious conversion in the first cabinet of independent India. Dr. Ambedkar, a prominent leader and social reformer, converted to Buddhism along with thousands of his followers in a mass religious conversion ceremony called the "Deeksha" in 1956. This event had a significant impact on the Dalit community in India and is considered a landmark in the history of religious conversions in the country.
Therefore, the correct answer is option 4.