A 68-year-old male is brought to the outpatient by his wife due to increasing forgetfulness. On taking history in details, wife repoed that for around 6 months patient is having trouble in organising the finances and paying bills, something he has done all his life. He has also become withdrawn and has decreased meeting people. The patient also behaved inappropriately with a female neighbour couple of says back, which is much against his usual nature. The patient denies having any problems and seems indifferent to his wife's concern. He has a medical history of hypeension and type 2 diabetes mellitus There is a family history of Alzheimer disease. On MMSE, score came out to be 23. Which of the following is the most likely diagnosis?