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: Anaesthesia
During laryngoscopy and intubation procedure, all of these are true, except: 
Select and explain. 
A. A slight pressure may be applied at the cricoid cailage, B. The laryngoscope is held in the right hand introduced from the right side of the patient, C. The neck is flexed with extension at the atlanto!occipital joint, D. After inseion of laryngoscope, it is levered on the upper incisor to pull up the tongue and visualize the vocal cords
D: After inseion of laryngoscope, it is levered on the upper incisor to pull up the tongue and visualize the vocal cords
Answer: D: After inseion of laryngoscope, it is levered on the upper incisor to pull up the tongue and visualize the vocal cords 
Explanation: Ans: D. After inseion of laryngoscope, it is levered on the upper incisor to pull up the tongue and visualize the vocal cords(Ref: Miller 81c, p I 666-7667. 71e p1587).The laryngoscope should never be hinged on the teeth to lift up the epiglottis.The patient is aligned in a "sniffing" position, i.e. neck (atlanto-axial joint) flexion and face extension (atlanto-occipital joint), at around 35deg and 15deg respectively