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
Which of the following is used as fungal stain tissue biopsy sections? 
Select and explain. 
A. PAS, B. Alizarin red, C. LPCB, D. Masson Trichrome
A: PAS
Answer: A: PAS 
Explanation: Ans. is 'a' i.e., PAS