Which of the following can cause abortion in females?

State True/False with explanation:
$(a)$ Abortions could happen spontaneously too. (True/False)
$(b)$ Infertility is defined as the inability to produce a viable offspring and is always due to abnormalities/defects in the female partner. (True/False)
$(c)$ Complete lactation could help as a natural method of contraception. (True/False)
$(d)$ Creating awareness about sex related aspects is an effective method to improve reproductive health of the people. (True/False)

Correct the following statements:
$(a)$ Surgical methods of contraception prevent gamete formation.
$(b)$ All sexually transmitted diseases are completely curable.
$(c)$ Oral pills are very popular contraceptives among the rural women.
$(d)$ In $E.T.$ techniques, embryos are always transferred into the uterus.

Match List-$I$ with List-$II$.

List-$I$	List-$II$
$A$. Vasectomy	$I$. Oral method
$B$. Coitus interruptus	$II$. Barrier method
$C$. Cervical caps	$III$. Surgical method
$D$. Saheli	$IV$. Natural method

Choose the correct answer from the options given below:

Sex determination using Barr bodies is possible through which of the following methods?

Which of the following cannot be detected in a developing foetus by amniocentesis?