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
Congenital colour blindness is transmitted as: 
Select and explain. 
A. Recessive disorder, B. Autosomal dominant, C. Sex-linked disorder, D. All of the above
C: Sex-linked disorder
Answer: C: Sex-linked disorder 
Explanation: Ans. Sex-linked disorder