During winter a person died during sleep, the room was closed and a container with burnt charcoal was found in the room. What may be the possible reason of his death ?

A person met with an accident and died instantly without and injury to heart, brain, stomach and kidney. One of the following is a reason for his death.

During old age ,the immunity of a person begins to decrease and as a result , the they become more susceptible to infections and diseases . What could be the probable reason for this ?

During old age ,the immunity of a person begins to decrease and as a result , the they become more susceptible to infections and diseases . What could be the probable reason for this ?

On a cold winter night, the persons sleeping in a room with closed door and windows with a coal fire burning inside may die due to the excessive accumulation of :

A person met with an accident and died instantly without any injury to heart, brain, stomach and kidney. ,br> One of the following is a reason for his death