Choose the correct statement $-$

$S -$ Statement: Mature seeds of opium are used to prevent stomach cramps.
$R -$ Reason: Anticancer drugs are not specific to a particular tumor.

Read the following statements carefully and identify the correct statements:
$(1)$ $TAB$ vaccine is used in typhoid.
$(2)$ Thymus is known as the $Training$ $School$ for $T$-lymphocytes.
$(3)$ Myasthenia gravis is an autoimmune disease.
$(4)$ Exaggerated response of the body to carcinogens is called allergy.
$(5)$ Turner's syndrome arises due to sex chromosome abnormality in females.

$A$: Newer antibiotics are required to be produced regularly.
$R$: Pathogens often develop resistance to existing antibiotics.

Consider the given statements and select the true ones $:-$
$(A)$ Health could be defined as a state of complete physical,mental and social well-being.
$(B)$ Pathogens can enter our body by various means,multiply and never interfere with the functions of organs/organ systems.
$(C)$ Salmonella typhi is a pathogenic virus which causes typhoid fever.
$(D)$ Plasmodium reproduces asexually in liver cells and $\text{RBC}$ of human.

Which of the following is a mental disease?