This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
The following are part of Hamstrings -a) Semitendinosusb) Semimembranosusc) Gracilisd) Short head of biceps femorise) Sartorius 
Select and explain. 
A. ac, B. ab, C. ad, D. bc
B: ab
Answer: B: ab 
Explanation: Hamstrings
-        Semimembranosus
-        Semitendinosus
-        Long head of biceps femoris
-        Ischial head of adductor magnus