This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular motility and squint, Subject name: Ophthalmology
Which of the following best defines the "Saccade"- 
Select and explain. 
A. Voluntary slow eye movements, B. Involuntary slow eye movement, C. Abrupt, involuntary slow eye movements, D. Abrupt, involuntary rapid eye movements
D: Abrupt, involuntary rapid eye movements
Answer: D: Abrupt, involuntary rapid eye movements 
Explanation: Saccades are sudden, jerky conjugate eye movements that occur as the gaze shifts from one object to another. Supranuclear eye movement systems include : Saccadic system Smooth pursuit system Vergence system Vestibular system Optokinetic sysytem Position maintenance system Ref;A.K.Khurana;6th edition; Page no: 341