This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
[{'content': 'A 40 year old female patient presented with dysphagia to both liquids and solids and regurgitation for 3 months. The dysphagia was non-progressive was non-progressive. What is the most likely diagnosis? \nSelect and explain. \nA. Carcinoma of the esophagus, B. Lower esophgeal mucosal ring, C. Achalasia cardia, D. Reflux esophagitis with esophageal stricture', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Presence of dysphagia to both solids and liquids suggests the diagnosis of achalasia Functional Grades of Dysphagia: Grade Definition I Eating Normally II Requires liquids with meals III Able to take semisolids but unable to take any solid foods IV Able to take liquids only V Unable to take liquids, but able to swallow saliva VI Unable to swallow saliva Ref: Sabiston 20th edition Pgno: 1049', 'role': 'assistant'}]