This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head & Neck, Subject name: Anatomy
[{'content': 'A 45 years old male patient complaints of double vision when walking upstairs. His past history is significant for Type-ll diabetes, well controlled with glyburide. The nerve most probably involved is \nSelect and explain. \nA. Abducent nerve, B. Oculomotor nerve, C. Trochlear nerve, D. Trigeminal nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer: (a) Abducent nerve.* Patient is having an injury to the abducent nerve (CN VI).* It innervates the lateral rectus muscle. Lateral rectus muscle moves the eyeball laterally (outwards). Therefore, a lesion of the abducent nerve results in internal strabismus (medial deviation) and diplopia (double vision).* The innervation of extraocular muscles can be remembered by a simple mnemonic, S04, LR6, 03. Superior oblique is innervated by 4th cranial nerve (trochlear), Lateral rectus by 6th cranial nerve (abducent), and others by 3rd cranial nerve (oculomotor).* The other muscles are superior, inferior and medial recti, and inferior oblique muscles.* The oculomotor nerve also supplies to levator palpabrae and carries parasympathetic fibers.* In abducent nerve lesion, the eye cannot look outwards due to paralysis of the lateral rectus.* The eye is turned inwards when trying to look straight ahead, due to the unopposed action of the medial, superior and inferior recti muscles supplied by the oculomotor nerve.', 'role': 'assistant'}]