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
XIB of xerophthalmia in WHO classification refers to 
Select and explain. 
A. Corneal sclerosis, B. Conjunctival sclerosis, C. Bitot spots, D. Corneal Ulceration
C: Bitot spots
Answer: C: Bitot spots 
Explanation: X1A - Conjunctival Xerosis
X1B - Bitot Spots
X2 - Corneal Xerosis.