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: Ophthalmology
Citiary muscles are embryologically derived from 
Select and explain. 
A. Neural ectokoderm, B. Mesoderm, C. Surface actoderm, D. Neural crest
B: Mesoderm
Answer: B: Mesoderm 
Explanation: None