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
[{'content': 'Superior oblique testing for 4th nerve is done by checking its intorsion while asking the subjet to look - \nSelect and explain. \nA. Straight down, B. Straight up, C. Down and in, D. Down and out', 'role': 'user'}, {'content': 'Answer: C \nExplanation: superior oblique is supplied by 4 cranial nerve- trochlear. Primary action of superior oblique is intorsion ( also called incycloduction- rotatory movement along anteroposterior axis in which superior pole of cornea (12 o clock point) moves medially.)secondary actions include depression and abduction.', 'role': 'assistant'}]