Question

 

One option is wrong between 5 choices, and pls explain why it is wrong.(and why the rest are right)

Pneumonia is especially serious in the young,  the infirm, and elders? 

1 especially 

2 the young 

3 and 

4 elders

5 serious

Thanks a million 

Answer 1

option "2", the young

Comments

Why? Please explain,