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: Medicine
Shirmer's test is used to assess 
Select and explain. 
A. Greater superficial petrosal nerve, B. Stapedial branch, C. Chorda tympani nerve, D. Stylohyoid branch
A: Greater superficial petrosal nerve
Answer: A: Greater superficial petrosal nerve 
Explanation: Answer is A (Greater superficial petrosal nerve): Shirmer's test is done to assess the integrity of Greater Superficial Petrosal Nerve (Branch of Facial Nerve) by assessing the Lacrimation function. Topographical Test for Facial Nerve Function Branch / Nerve assessed Shirmer's test Greater Superficial Petrosal Nerve (GSPN) Stapedial Reflex Accoustic Reflex Stapedial branch (Branch to stapedius) Electrogustometry (Taste testing) Chorda Tympani Branch Salivary Flow Rate Chorda Tympani Branch