When food is swallowed, it needs to pass through the esophagus into the stomach. The epiglottis is a flap of tissue that prevents food and liquids from entering the windpipe (trachea) and directs them to the esophagus.
If the epiglottis fails to close properly during swallowing, food may enter the trachea and cause a coughing reflex to clear the airway. This is the cause of coughing during swallowing.
Thus, the correct answer is Option (A): Epiglottis.
Match the following types of bones with examples:

Arrange the following in sequence the events of mechanism of vision:

Match the following:

Assertion: The male ants are developed by parthenogenesis from unfertilized eggs.
Reason: The sex of offspring depends on the type of sperm that fertilizes the ovum, which is not relevant since male ants develop through haploid parthenogenesis, which does not involve fertilization.
Match the following:
