Many diseases can be diagnosed by observing the symptoms in the patient. Which group of symptoms are indicative of pneumonia?

a. Difficulty in respiration, fever, chills, cough, headache

b. Constipation, abdominal pain, cramps, blood clots

c. Nasal congestion and discharge, cough, sorethroat, headache

d. High fever, weakness, stomach pain, loss of appetite and constipation