<prompt> Most common malignant tumour of parotid isAcinic cell carcinomaMucoepidermoid carcinomaSquamous cell carcinomaAdenocystic carcinoma  <response>: Mucoepidermoid carcinoma is the most common malignant tumor of the parotid gland and can be divided into low-grade and high-grade tumorsRef: Sabiston, 20e, page no: 830 