Q. A 62-year-old man is brought to the emergency department by his son because of a sudden onset of right lower limb weakness and difficulty speaking that started an hour ago. The patient unintentionally is urinating in the emergency department. He has a history of hypertension, type 2 diabetes, and atrial fibrillation. His medications are enalapril, metformin, and propranolol. His blood pressure is 145/90 mmHg, and the remaining vital signs are normal. Babinski's sign is positive on the right side, and his muscle strength is 2/5 on that side but 5/5 on the left. The sensation's diminished in the right lower extremity. Which of the following is the cause of this patient’s presentation?