A. It begins with an ordinary fever and a moderate cough.
B. India could be under attack from a class of germs that cause what are called atypical pneumonias.
C. Slowly, a sore throat progresses to bronchitis and then pneumonia and respiratory complications.
D. It appears like the ordinary flu, but baffled doctors find that the usual drugs don't work.
(CAT1997)
BA and BD are both possible starts (the "It" in statements A and C referring to atypical pneumonias); but take a quick look at the options. BD is the only option. Answer is option (b)