This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Radiology
Which is the most commonly involved muscle in cases of abdominal wall hematoma? 
Select and explain. 
A. Rectus abdominis, B. External oblique, C. Internal abdominis, D. Transverses abdominis
A: Rectus abdominis
Answer: A: Rectus abdominis 
Explanation: Ans AMost commonly involved muscles - incases of traumatic hematomas - in descending order of frequency are:# Rectus abdominus (Most common).# Iliopsoas.# Thighs# Gluteal.