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: Dental
[{'content': 'The functions of myoepithilial cells may be: \nSelect and explain. \nA. Initiating contraction, B. Support for the end piece during active secretion of saliva, C. Provide signals to the acinar secretory cells for structural organization, D. All of the above.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]