<prompt> Most common site for the initiation of otosclerosis is -Foot plate of stapesMargins of stapesFissula ante fenestramFissula post fenestram  <response>: Most common type of otosclerosis Stapedial otosclerosisMost common site of otosclerosis Fissula ante fenestram i.e. just in front of oval windowMost common site for stapedial otosclerosis Fissula ante fenestram i.e. just in front of oval windowMost common site for cochlear otosclerosis Round windowRef. Dhingra 5e, p 97-98, 6e, p 86-87 