This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Death and Investigations, Subject name: Forensic Medicine
[{'content': 'Diatoms are seen in \nSelect and explain. \nA. Infanticide, B. Drowning, C. Hanging, D. Mummifications', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B. i.e. (Drowning) (3.69 - Parikh 6th)DIATOMS - is unicellular algae**, have silicaceous cell wall (Best site of sample - Bone marrow in femur**)* **Since diatoms resist putrefaction, diatom test may have some value in examination of decomposed bodies* The test is negative in dead bodies thrown in water and in dry drowning (Tissues from brain, liver and BM)*Gettler\'s Test used in Drowning to estimate the chloride content of blood from both sides of the heart Diagnostic features of drowning - is fine white latheary tenacious froth or foam rarely tinged with blood (other causes are - chest - compression, opium poisoning, slow asphyxia. Putrefaction).i. Cutis - anserine** - goose - skin or goose flesh - the granular and puckered appearance of the skin and "pataufs hemorrhage"**ii. Washer - woman *s hand - the slan of the hands or feat shows bleached, corrugated and sodden appearance* Commonest type of Drowning is - Suicidal**', 'role': 'assistant'}]