This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Which of the following area lies immediately lateral to the anterior perforating substance? 
Select and explain. 
A. Uncus, B. Orbital gyrus, C. Optic Chiasma, D. Limen Insulae
D: Limen Insulae
Answer: D: Limen Insulae 
Explanation: Anterior perforating substance is an irregularly quadrilateral area in front of the optic tract and behind the olfactory trigone, from which it is separated by the fissure prima; medially and in front, it is continuous with the subcallosal gyrus; it is bounded laterally by Limen insulae of the olfactory tract and is continued into the uncus.