Germany introduced which weapon during the Second Battle of Ypres in 1915?

Here is the question :

GERMANY INTRODUCED WHICH WEAPON DURING THE SECOND BATTLE OF YPRES IN 1915?

Here is the option for the question :

• Tanks
• Machine guns
• Poison gas
• Flame throwers

The Answer:

And, the answer for the the question is :

Explanation:

[STC0012012]. At the outset of World War I, Germany began experimenting with poison gas. The first effective deployment of poison gas occurred in April 1915, when German troops released 150 tons of chlorine gas on Allied troops in Belgium during the Battle of Ypres. This prompted the Allied side to start making their own poison gas. More than a hundred thousand tons of chemical weapons were employed by the end of the conflict, resulting in over a half a million casualties and about thirty thousand deaths.