Quoc: The Master of Surgery (Latin: Magister Chirurgiae) is an advanced qualification in surgery. Depending upon the degree, it may be abbreviated Ch. M., M.Ch., M. Chir. or M.S. At a typical medical school the program lasts between two and three years. The possession of a medical degree is a prerequisite. The Ch. M. can be awarded on both clinical and academic competency or on academic competency. The regulations may ask for surgical experience and a thesis topic that is not purely medical.

Answer this question based on the passage: what is the full form of ms in medical?
HW Chung: OK, some thoughts:
To answer the above question, the relevant sentence is: Depending upon the degree, it may be abbreviated Ch. M., M.Ch., M. Chir. or M.S. The answer is Master of Surgery.