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
[{'content': 'A patient is NOT able to look downward. Which muscle may be paralyzed? \nSelect and explain. \nA. Superior oblique, B. Superior rectus, C. Inferior oblique, D. Lateral rectus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: MUSCLES helping in looking down - Inferior rectus - primary function supplied by 3rd cranial nerve Superior oblique - secondary function-suppliecd by 4th cranial nerve', 'role': 'assistant'}]