Old John goes to see a doctor.The doctor examines him and sa

Old John goes to see a doctor.The doctor examines him and says,”Medicine can’t help you.You must have a good rest.Go to a quiet place for a month ,go to bed early,drink some milk,walk a lot and smoke one cigar a day.”
“Thank you very much,”say Oid John.“I can do everything you say,”Amonth later,Old John comes to the doctor again.“Well,”says the doctor,“I am giad to see you.You look much younger.
“Oh,doctor,”saysOid John,“I feel quite well now.I have a good rest.I go to bed early,I drink a lot of milk and I walk a lot .Your advice certainly heips me.But you asks me to smoke one cigar a day,and the one cigar a day nearly kills me at first.It is no joke to start smoking at my age.
（ ）3.Which one is true?
a.old john smokes now.
b.old john doesn't smoke now
c.old john smokes less than before.
d.old john doesn't smoke a cigar a day

a 正确