. Late blight of potato is caused by that belongs to class
A: Phytophthora infestans, Oomycetes
B: Helminthosporium oryzae, Deuteromycetes
C: Alternaria solani, Deuteromycetes
D: Albugo candida, Oomycetes
Late blight of potato mostly infects the potato crops and can lead to failure of the crops in a short duration.
It is caused by the fungus, Phytophthora infestans belonging to the class Oomycetes.
Hence, option A, i.e., Phytophthora infestans, Oomycetes is the correct answer.