Please select the eligibility criteria that correspond to the clinical trial below.
Title: A Randomized Double-blind Controlled Trial of Use of Dydrogesterone in Women With Threatened Miscarriage in the First Trimester
Brief Summary: The aim of this study is to determine whether the dydrogesterone therapy is associated with reduction in miscarriage in women with first trimester threatened miscarriage. The hypothesis is that the dydrogesterone therapy will significantly reduce the risk of miscarriage in women with threatened miscarriage.


Options:
A: Inclusion Criteria:

* Age of women from 18-40 years at the time of recruitment (not beyond 40th birthday)
* Absence of fever
* Gestation less than 12 completed weeks as defined by pelvic ultrasound
* Presence of intrauterine gestational sac(s) if an urine pregnancy test is first positive within past 2 weeks
* Presence of intrauterine fetus(es) with crown-rump length of \<7mm and no fetal pulsation, or presence of intrauterine fetus(es) with positive fetal heart pulsation confirmed on pelvic scanning

Exclusion Criteria:

* Age of women \>40 years at the time of recruitment
* History of recurrent miscarriage defined as at least three consecutive spontaneous miscarriages
* History of known parental chromosomal abnormalities
* Heavy vaginal bleeding requiring surgical intervention
* Severe abdominal pain requiring surgical intervention
* Absence of cardiac pulsation in a fetal pole with crown-rump length of \>=7mm on transvaginal scanning
* Use of hCG or progesterone treatment for threatened miscarriage prior to recruitment
B: Inclusion Criteria:

* Age: 24-37
* Gestational week: 7- 12
* Evidence of threatened miscarriage (pelvic pain with or without vaginal bleeding)
* Ultrasound evidence of subchorionic hematoma

Exclusion Criteria:

* Lack of fetus
* Absence of fetal heart tone
* Uterine anomaly or fetal anomaly
* Presence of multiple pregnancy
* Gestation pathology
* Therapies with anti-coagulants or anti-hypertensive drugs
C: Inclusion Criteria:

* 14 to 21 weeks gestation, based on menstrual history and clinical exam (with or without ultrasound)
* Meet legal criteria to obtain abortion
* Present with closed cervical os and no vaginal bleeding
* Live fetus at time of presentation for service
* Have no contraindications to study procedures, according to provider
* Be able to consent to procedure, either by reading consent document or by having consent document read to her
* Be willing to follow study procedures

Exclusion Criteria:

* Known previous transmural uterine incision
* Known allergy to mifepristone or misoprostol/prostaglandin or other contraindications to the use of mifepristone or misoprostol
* Any contraindications to vaginal delivery, including placenta previa
* Presentation in active labor (defined as moderate to severe contractions every 10 minutes or less)
D: Inclusion Criteria:

* Women with singleton pregnancy at 22+0nd to 31+6nd week of gestation presenting with a cervical length ≤25 mm, after an episode of preterm labour.

Exclusion Criteria:

* Women with previous spontaneous PTD, multiple pregnancy, rupture of membranes, feto-maternal conditions indicating delivery, mullerian malformations, cervical surgery (cervical cerclage etc), presence of regular uterine contractions

Answer: A