This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lower Extremity, Subject name: Anatomy
Floor of Petit triangle is formed by- 
Select and explain. 
A. Sacrospinalis, B. Internal oblique, C. Rectus abdominis, D. Fascia Transversalis
B: Internal oblique
Answer: B: Internal oblique 
Explanation: Ans. is 'b' i.e., Internal oblique The lumbar triangle (Petit's triangle) is a weak area in the posterior part of the abdominal wall. It is bounded anteriorly by the posterior margin of the external oblique muscle, posteriorly by the anterior border of the latissimus dorsi muscle, and inferiorly by the iliac crest. The floor of the triangle is formed by the internal oblique and the transversus abdominis muscles.