Explanation

Anwarul Haq Kakar is historically recognized for being the longest serving Caretaker Prime Minister of Pakistan. Ghulam Mustafa Jatoi was a caretaker PM but not the longest serving one. Shahbaz Sharif has served as PM but not specifically as the longest-serving caretaker PM. Zulfiqar Ali Bhutto did not serve as the longest-serving caretaker PM.