A 36 years male presented with complain of productive cough and fever for last 2 months. He has undergone kidney transplantation 2 years back. His sputum examination revealed a gram positive filamentous bacteria that showed acid fastness with modified Ziehl-Neelsen staining (1% H2SO4). The most likely etiological agent is ?: (A) Actinomyces israelii, (B) Nocardia asteroides, (C) Blastomyces dermaiiiidis, (D) Crfptosperidium parvum
Answer is B. Ans. is 'b' i.e., Nocardia asteroides