You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Common carcinoma of upper 1/3 oesophagus: and explain in detail?
Ans. (b) Squamous cell carcinomaRef: Bailey and love 26th Edition, Page 1004* Most common type of cancer in upper 2/3rd is squamous cell carcinoma.* Most common type of cancer in lower third is adenocarcinoma* Most common type in the world, India: Squamous cell cancer* Most common type in western countries: Adenocarcinoma