How many brain cells do you have?
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100 000 (One Lakh)
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1 000 000 (one million)
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1 000 000 000 (one thousand million)
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100 000 000 000 (one hundred thousand million)
The human brain contains approximately 86-100 billion neurons (100,000 million is the closest option). Option C (1 billion) is far too few - even a fruit fly has about 100,000 neurons. The actual number is in the tens of billions, making D the only reasonable answer among the choices.
The human brain contains roughly 100 billion neurons, often popularly rounded to 'one hundred thousand million.' This staggering number of interconnected cells is what allows for the brain's complex processing and signaling capacity. Smaller figures like one million or one thousand million dramatically understate the brain's actual neuron count.