Citrus canker (lesions), which originated from China is caused by pathogen

Answer: Option A

Citrus canker (lesions), which originated from China is caused by the pathogen Xanthomonas campestris pv. citr.
Citrus canker is a disease affecting Citrus species caused by the bacterium Xanthomonas (X.axonopodis; X. campestris).
Infection causes lesions on the leaves, stems, and fruit of citrus trees, including lime, oranges and grapefruit.
The disease, which is believed to have originated in Southeast Asia, is extremely persistent when it becomes established in an area.