The incidence of a disease is five times greater in men than in women, but the prevalence shows no sex difference. The most likely explanation is ________.
1) The disease affects men and women equally, but men are more likely to seek medical attention.
2) The disease affects men and women equally, but women are more likely to seek medical attention.
3) The disease affects men and women differently, but the prevalence is not influenced by gender.
4) The disease affects men and women differently, but the incidence is not influenced by gender.