After hyperventilation for some time holding the breath is dangerous since: (A) It can lead to CO2 narcosis, (B) due to lack of stimulation by CO2, anoxia can go into dangerous level, (C) I-0O2 shift 0 dissociation curve to left., (D) Alkalosis can lead to tetany
Answer is B. B i.e. Due to lack of stimulation by CO2, anoxia can go into dangerous level