This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conjunctiva, Subject name: Ophthalmology
The normal pH of tear is (REPEATED) 
Select and explain. 
A. 5.7, B. 7.5, C. 6.5, D. 7.9
B: 7.5
Answer: B: 7.5 
Explanation: pH of tear is 7.4 Refer: Khurana 6th edition page number 366