when ashutosh was adopted he was abt 8 yrs kid so if he started his schooling at that age then its possible that mallu n ashu were classmatessee even if he was doing his masters at the time ( assuming she got admission at medical college at 18) they can't be seeing each other. So what ever 'friendship' they have must be at the hospital only.
Again assuming ashutosh completed his MS at 24+3= 27 , he is at the hospital for 15 years and Dr.M must have joined there as an intern at the age of 24 and now she is 35 (35- 24=11)if she too has done her MS, then the whole calculation goes wrong🤪