MRCP2-1011

MRCP2-1011

A 32-year-old man is admitted to the hospital with symptoms of a flu-like illness that have worsened over the past few days. He now has a productive cough, fever, and shortness of breath. The initial diagnosis is community-acquired pneumonia, and he is prescribed oral co-amoxiclav 625 mg three times daily.

Three days later, he develops a macular rash on his arms and legs. The rash is non-itchy and consists of pink-red blotches with a paler center. He also experiences a burning sensation. What is the most probable cause of the rash?