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
Loss of lacrimation occurs due to injury of 
Select and explain. 
A. Nasocilliary nerve, B. Greater petrosal nerve, C. Anterior ethmoidal nerve, D. Supraorbital nerve
B: Greater petrosal nerve
Answer: B: Greater petrosal nerve 
Explanation: Parasympathetic secretomotor nerve fibres destined for the lacrimal gland arise from the lacrimal nucleus of the facial nerve. They travel via the great petrosal nerve to reach the lacrimal gland. Consequently injuries of the greater petrosal nerve can cause loss of lacrimation.