The correct option is A Difficulty in respiration, fever, chills, cough, headache
Bacteria like Streptococcus pneumoniae and Haemophilus influenza are responsible for the disease pneumonia in humans, which infects the alveoli (air-filled sacs) of the lungs. As a result of the infection, the alveoli get filled with fluid leading to severe problems in respiration. The symptoms of pneumonia include difficulty in respiration, fever, chills, cough and headache.