Commercially, opium is obtained from which part of the plant?

Which substance is obtained from $Cannabis \text{ sativa}$?

Which two analgesic drugs are obtained from the part labeled $-'A'$ in the given figure?

Assertion : Dope test is used to estimate the level of blood alcohol by analyzing the breath of persons drinking alcohol.
Reason : $A$ drunken person usually feels tense and less talkative.

Identify the correct statements from the following:
$(i)$ With repeated use of drugs,the tolerance level of the receptors present in the body increases.
$(ii)$ Youngsters often use drugs repeatedly due to financial gains.
$(iii)$ Lack of proper guidance or counseling leads individuals to become addicts.
$(iv)$ Repeated use of alcohol leads to 'withdrawal syndrome'.

What condition occurs in an individual if they suddenly stop the consumption of addictive substances?