Which was the official language declared in 1956 constitution?

Explanation
Constitution  of 1956  · Pakistan was declared as the  Islamic Republic while Both Urdu and Bengali  were declared as official and national languages of Pakistan in the  1956 constitution All important questions of  "the  1956 constitution " 1956 constitution is  promulgated   on 23 March 1956 *** Iskander Mirza   abrogated   the 1956 constitution *** In 1956 the  designation  of  Governor General  changed to  President **** 40 years  was the   age prescribed  for president in the 1956 constitution ** T he Constitution of 1956 contained   234 articles  divided   into thirteen parts and six schedules ** The constitution of 1956 remained  implemented  for  2 years 6 months and 14 days. ** The constitution of 1956 provided a   Parliamentary   form of  government  for the country. ** 1956 constitution   legislature   was   Unicameral ** The Constitution of 1956 provided for a   federal system   with the principle of  parity  between  East Pakistan  and  West Pakistan ND16-1-2023 **** nd9-2-2023 ND 12-2-2023 SH26-8-2023