A 68 year old male presented with swelling in the lower pole of the parotid gland for the last 10yrs. Examination: firm in consistency. What’s the most probable diagnosis?

The key is A. Pleomorphic adenoma. [Pleomorphic adenoma (most common) - also called benign mixed tumour: is the most common tumour of the parotid gland and causes over a third of submandibular tumours. They are slow-growing and asymptomatic, having a malignant potentiality].