This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Which of the following has serous secretion? \nSelect and explain. \nA. Pancreas, B. Parotid gland, C. Sub mandibular salivary gland, D. Minor salivary gland', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most animals have three major pairs of salivary glands that differ in the type of secretion they produce: parotid glands produce a serious, watery secretion. submaxillary (mandibular) glands produce a mixed serous and mucous secretion. sublingual glands secrete a saliva that is predominantly mucous in character. (Ref: vivo.colostate.edu)', 'role': 'assistant'}]