system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
True about otosclerosis -a) 50% have family historyb) Males are affected twice than femalesc) More common in Negro's and African'sd) Deafness occurs in 20-30 yrs but less in before 10 yrs and after 40 yrse) Pregnancy has bearing on it
assistant
The correct answer is  None