A2-year-old child with a 5-day history of an upper respiratory tract infection is brought to the pediatrician’s office by her mother. the mother states that her child has been irritable and pulling at her ears. the pediatrician examines the child’s ears and diagnoses inflammation of the middle ear

Middle ear infection or otitis media

Explanation:

It’s a common infection during flu in children (less common in adults). This occurs because the respiratory tract is swollen and with mucous, this can  block the eustachian tube, the tube that connects pharynx with the middle ear, causing ear’s fluid retention giving place to bacteria or virus reproduction (commonly the same causing flu) making ear inflammation and infection.

im not intirely sure but i think the anwser is d relative humidity