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: Pathology
Blood smear is best seen at pH of - 
Select and explain. 
A. 7.2, B. 6.8, C. 6.6, D. 7
B: 6.8
Answer: B: 6.8 
Explanation: None