This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Squint, Subject name: Ophthalmology
Not true regarding Optic Nerve 
Select and explain. 
A. Made of axons of 2nd order neuron in visual pathway, B. 47-50 mm length, C. Intracranial pa is the longest, D. Smallest pa is intraocular
C: Intracranial pa is the longest
Answer: C: Intracranial pa is the longest 
Explanation: CRANIAL NERVE Optic nerve arises from ganglion cell axons. *Length = 47-50mm. *Can be considered as pa of brain *3rd order neuron *Protected by meninges *Pas: Intraocular, Intraorbital, intracanalicular, intracranial *Smallest pa of optic nerve is intraocular *Longest pa : Intraorbital Order of Neurons *Rods & Cones (Photoreceptors) *Bipolar Cells: 1st order Neuron *Ganglion Cells: 2nd order Neuron *Neurons that take impulse from LGB to Brain: 3rd order neuron