<prompt> Which of the following is not true of Diplococcus pneumoniae -Bile solubilityOptochin resistanceCauses MeningitisPossesses capsule  <response>: Ans. is b i.e., Optochin resistance . Pneumococcus is optochin senstive not resistant. The senstivity of pneumococci to optochin is useful in differentiating them from streptococci. 