<prompt> There are 40 new cases of carcinoma of breast per 100,000 women year in country X 100 new cases 100,000 women year in Country Y. Based on this statistical data which of the following statement is true?More women in Country Y are smokersMore women in Country X had breastfed their childrenCountry X has more number of younger women than country YMore preventive screening measures like mammography are available in Country X  <response>: Age is the most impoant risk factor for breast cancer Breast cancer is uncommon below age of 35, its incidence is increasing rapidly bw ages of 35 to 50. A slight bimodal trend in the age distribution has been observed with a dip in incidence at the time of menopause. A secondary rise in frequency often occurs after the age of 65. Women who developed their first breast cancer under the age of 40, had three times the risk of developing a second breast cancer than those who developed their first cancer after the age of 40 Indeed the etiologies of pre-menopausal post-menopausal breast cancer appears to be different. Other Risk factors of breast cancer: Family history of breast cancer Delayed first pregnancy Early menarche and late menopause Elevated estrogen progesterone levels Prior breast biopsy Higher socio-economic status Radiation exposure etc. 