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: ENT
Calculus is most commonly seen in which salivary gland: 
Select and explain. 
A. Sublingual, B. Palatal, C. Parotid, D. Submandibular
D: Submandibular
Answer: D: Submandibular 
Explanation: Stone formation is most common in submaxillary (submandibular) gland (80-90% cases) followed by parotid gland (10-20%). It can occur at any age with a predilection for men. Predisposing factors for stone formation are systemic disease (Hyperparathyroidism, hypercalcemia, gout, diabetes and hypeension) therefore submandibular calculi contain primarily calcium phosphate and hydroxyapatite and are radiopaque and visualized on X-ray Parotid gland calculi are less radiopaque M/C presentation - Recurrent swelling and pain in the submandibular gland exacerbated with eating. IOC to detect stones - CT scan Sialography is not done routinely and is contraindicated in a patient of sialadenitis. Management Depending on the size of stone and the site at which it is located, it can be removed by: Intraoral extraction Surgical excision Endoscopic removal