This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
All are true regarding Prostaglandins except: 
Select and explain. 
A. LT cause vasoconstriction and decreased vascular permeability, B. 20 carbon unsaturated fats, C. Prostacyclin inhibits platelet aggregation, D. Prostaglandins cause uterine muscle contraction & induce labor
A: LT cause vasoconstriction and decreased vascular permeability
Answer: A: LT cause vasoconstriction and decreased vascular permeability 
Explanation: Ans-ARef: Harpers illustrated Biochemistry,28th editionExplanation:Synthesis from arachidonate (See figure on the next page)FUNCTIONSProstacyclin (PGI2)Inhibit platelet aggregationVasodilatationPGF:Uterine muscle contractionInduce laborBronchoconstrictorPGE:BronchodilatorCauses inflammationThromboxaneSynthesis: plateletFunction: platelet aggregationAspirin - Inhibits TXA2 - | Platelet aggregationAspirin is used in the treatment of myocardial infarctionLeukotrienesThe site of synthesis: leukocytes, platelets, macrophagesSlow reacting substance (SRS-A)Leukotrienes-C, D, EFunctions: InflammationVasoconstrictionBronchoconstriction