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
Muscles used in normal walk during stance and swing: 
Select and explain. 
A. Popliteus, B. Gastrocnemius, C. Tibialis anterior, D. Iliopsoas
B: Gastrocnemius
Answer: B: Gastrocnemius 
Explanation: Gastrocnemius