A 78-year-old man is admitted to the stroke ward. You are asked to examine him. He denies any headache. You find he has normal motor function but has completely lost sensation on the right-hand side of his body. There is no hemianopia or dysphasia. What type of stroke is this?
a) Ischemic stroke
b) Hemorrhagic stroke
c) Lacunar stroke
d) Transient ischemic attack (TIA)