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
A person has defective blue colour appreciation. His condition is better named as- 
Select and explain. 
A. Deuteranomalous, B. Deuteranopia, C. Tritanopia, D. Tritanomalous
D: Tritanomalous
Answer: D: Tritanomalous 
Explanation: For defective (anomolous) colour vision, Suffix anomalous is used; and for absent colour, suffix anopia is used.