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
All except one is true regarding Suboccipital triangle 
Select and explain. 
A. Semispinalis capitis forms roof of suboccipital triangle, B. Rectus capitis posterior major and minor form boundaries of suboccipital triangle, C. Posterior atlantooccipital membrane forms floor of the triangle, D. It contains 3rd part of vertebral artery
B: Rectus capitis posterior major and minor form boundaries of suboccipital triangle
Answer: B: Rectus capitis posterior major and minor form boundaries of suboccipital triangle 
Explanation: Rectus capitis posterior minor doesn’t form boundary of suboccipital triangle, even though it is seen in this region.