Concept:Shingles and itching skin infections are common opportunistic conditions seen when the immune system is weakened.Explanation:HIV/AIDS damages the immune system, making the body vulnerable to infections.Shingles (herpes zoster) and persistent itchy skin infections are among the signs that appear in people living with HIV/AIDS.The other options cause different symptoms: cholera causes severe diarrhoea, gonorrhea is a sexually transmitted infection, and diabetes affects blood sugar levels.Answer:A. HIV and AIDS