<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:An 85-year-old man who recently immigrated to the US from Spain presents to your office complaining of hoarseness and dysphagia for the past 2 months. He says his symptoms have been getting progressively worse, and he expresses concerns about the difficulty swallowing as he cannot eat well and has even lost 9 kg 20 lb since his last visit 3 months ago. He denies any shortness of breath, coughing of blood, and chest pain. His bowel and bladder habit are normal. Past medical history is unremarkable. He has a 60-pack-year history of smoking tobacco and drinks alcohol occasionally. Which of the following is the most likely cause of his symptoms?? A: Malignant proliferation of squamous cells, B: Transformation leading to metaplasia in the lower esophagus, C: Malignant proliferation of glandular tissue in the esophagus, D: Reduced lower esophageal pressure, E: Chronic autoimmune gastritis,  <response>: Based on the patients symptoms of hoarseness, dysphagia, and significant weight loss over a few months, the most likely cause is a malignant tumor obstructing the esophagus. The patients risk factors of male gender, advanced age, smoking history, and European ethnicity point towards squamous cell carcinoma as the most likely malignancy. Metaplasia and chronic gastritis would not present with dysphagia and significant weight loss. Reduced lower esophageal sphincter pressure could cause dysphagia but not the other symptoms. Therefore, malignant proliferation of squamous cells is the most likely diagnosis.A: Malignant proliferation of squamous cells 