The correct answer is: A. TI
TI stands for Train Inspector. They are responsible for inspecting the safety and efficiency of train operations. They also conduct examinations to ensure that train working staff are qualified to work on the railway.
CI stands for Chief Inspector. They are responsible for overseeing the work of TIs. They also conduct investigations into accidents and incidents.
LI stands for Loco Inspector. They are responsible for inspecting the safety and efficiency of locomotives. They also conduct examinations to ensure that locomotive drivers are qualified to operate locomotives.
None of these is the correct answer because they are not responsible for examining the knowledge of subsidiary rules of train working staff of another Railway.