In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.

Question: What type of amino acid side chains will compete with saline ions for solvation water ?: 
 Options:  <0> Apolares. <1> Aliphatic <2> Aromatic <3> Polar <4> Without charge.
chemistry

Question: Why do ovarian cycles not appear in nursing mothers for several months after birth ?: 
 Options:  <0> For stress and lack of sleep associated with breastfeeding. <1> Because there are low levels of FSH and LH. <2> Because there are high levels of oxytocin. <3> By saving iron that is derived from breastfeeding. <4> Because there are high levels of progesterone.
pharmacology

Question: Acute ischemia of a limb consists of a sharp decrease in arterial perfusion. It is important to differentiate between thrombosis and arterial embolism to be able to indicate the most appropriate treatment. Which of the following is correct? 
 Options:  <0> The presence of embolic focus and distal pulses in the contralateral limb leads to the suspicion of arterial thrombosis. <1> If the patient has a history of claudication and the clinic is of sudden onset, we will suspect arterial embolism in the first place. <2> If the contralateral limb has all the pulses present and the clinic starts slowly, we will suspect an arterial thrombosis. <3> If the clinic starts abruptly in a patient with embolism focus, we will suspect arterial embolism. <4> If the patient is a carrier of a previous arterial derivation, we will suspect arterial embolism.

medicine