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
Infrahyoid ribbon muscles are contained in - 
Select and explain. 
A. Muscular triangle, B. Submental triangle, C. Anterior digastric triangle, D. Carotid triangle
A: Muscular triangle
Answer: A: Muscular triangle 
Explanation: Infrahyoid ribbon muscles are the chief contents of muscular triangle.