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: Surgery
Parotid gland contains 
Select and explain. 
A. Serous acini, B. Mucinous acini, C. Serous and mucinous acini with equal proportion, D. 75 % serous acini and 25 % mucinous acini
A: Serous acini
Answer: A: Serous acini 
Explanation: Parotid glands - Contain serous acini
Sub lingual glands - Contain mucious acini
Minor salivary glands - Contain mucious acini
Submandibular glands - Contain both serous and mucinous acini