<prompt> A patient comes with history of unresponsive fever and cough. X-ray revealed pneumonia. Sputum examination showed gram positive, partially acid fast bacteria with branching filaments that grows on sheep blood agar. The most likely etiologic agents is:ActinomycetesNocardiaAspergillosisPneumococci  <response>: Ans. is b i.e., NocardiaRef: Ananthanarayan, 8the, p. 393; 9the, p. 394; Harrison, 18the, p. 1324; Jawetz, 24the, p. 182The typical morphology of Nocardia is Acid Fast filamentous bacteria with right angle branching. 