Which of the following can be used for obtaining specimen for isolation of microorganism in laboratory diagnosis

Which of the following can be used for
obtaining specimen for isolation of
microorganism in laboratory diagnosis:
a) Meningococcal rash
b) Blood in staphylococcal food poisoning
c) Throat swab in Rheumatic fever
d) Blood in post-streptococcal GN
Correct Answer - A
Ans. is. a’ i.e. Meningococcal rash