Statement: Prostitution is also one of the main reason of AIDS.
Conclusions:
I. AIDS is an incurable disease.
II. AIDS cannot be completely controlled by banning prostitution only.
If only conclusion II follows
Prostitution is not the only reason of AIDS. It is one of the main reasons of this disease. Hence, banning only prostitution cannot work 100% to control this disease. It means other factors must be considered also. Therefore, II is a valid conclusion. Conclusion I is invalid as it has not been discussed in the statement that AIDS is curable or not.