Which kind of system of Government was introduced in 1973 constitution?

Explanation
The parliamentary system of Government was introduced in the 1973 constitution. *** The 1973 Constitution, is the supreme law of Pakistan. Zulifqar Ali Bhutto introduced the 1973 constitution in Pakistan on August 14, 1973. According to the 1973 constitution, the Provincial Assembly, National assembly, and senate elect the President. Whereas the prime minister is elected by the only national assembly. The bicameral Legislature system was introduced for the first time in Pakistan in the constitution of 1973. **