This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Airway, Subject name: Anaesthesia
Best position for intubating on adult patient when using macintosh laryngoscope- 
Select and explain. 
A. Shoulder elevated, B. Flexion of the lower cervical spine and extension of head, C. Flat on the bed, D. Hyperextension of neck
B: Flexion of the lower cervical spine and extension of head
Answer: B: Flexion of the lower cervical spine and extension of head 
Explanation: This is called morning sniffing position. There is movement on two joints atlantoccipital jt and neck joint . Atlantoccipital joint is extended. Neck joint is flexed.