This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Front of Thigh, Subject name: Anatomy
Which is the longest muscle of the body: 
Select and explain. 
A. Sartorius, B. Extraocular muscle, C. External oblique, D. Popliteal muscle
A: Sartorius
Answer: A: Sartorius 
Explanation: Ans. A SartoriusRef: BDC, 6th ed. vol. II pg. 53* Sartorius muscle is the longest muscle of the body.* It is also known as tailor's muscle (Sartor = tailor)