This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscles of Lower Limb, Subject name: Anatomy
Which of the following muscles is included in 'Triceps surae'? 
Select and explain. 
A. Plantaris, B. Popliteus, C. Extensor hallucis longus, D. Extensor digitorum longus
A: Plantaris
Answer: A: Plantaris 
Explanation: The superficial muscles - gastronemius, plantaris and soleus are referred as triceps surae or gastro- soleus. This is responsible for plantar flexion. Triceps surae is supplied by posterior tibial nerve.